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Furuno GP-1250 User's Manual
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1. 135 23 SY 1 g idc 5 12 S To magnify the presentation gt 9 ee amp Press DS sse To return the indication to 25 42 21 N the normal size press 13523 33E nu When the job is over press CLR The highlighted rectangle disappears i 25 42 21 N 135 23 33 E If you leave your GP 1250 unattended for hours turnthe SCREEN BRILLIANCE control counterclockwise until a click is felt Under this condition the GP 1250 operates in ECONOMY POWER SAVING mode i e the CRT is turned off completely but the internal electronics continues position fixing etc If you want to TURN THE ENTIRE SYSTEM OFF press the PWR and OFF keys simultaneously This arrangement prevents the power from being shut down accidentally 12 BASIC In this section you will control the plotter screen by pressing the keys illustrated right Turn the power on then display the plotter screen Displayi C The cross cursor serves to enter a mark on a desired position etc Press the key several times and you will see a CROSS CURSOR appears and disappears alternately The cursor pointed latitude and longitude and the bearing range observed from the present position are read as illustrated below Lat long at the 34 5 25 N cursor crossing d 135 23 41 E Bearing range of the cursor po
2. 573035 UOLO mmis smeis poy SOPO 540 PUIU 40 1 OL d 9sn opojq BUNT JOSIND 55010 22222222222 9 L d T9 wog 8 3517 661 NSl CZ 7C Suoje V WNIbvE 05 72 80 JosIng ET d ut OLW PPIM SIJO Su 69d LIS Wey uedef f d IWD i 8 4 lt 29S WW JH ey 1u2A 099495 00 je 23 081261930 2 09 16 015 gt You can know from the NAV STATUS Indication what your GP 1250 is doing About NAV STATUS indication Status COLD START This is an exceptional start up condition The GP 1250 was turned on without Almanac inside The GP 1250 imme diately starts acquiring a satellite in order to receive Almanac If you know what satellite is available in line of sight conduct the COLD START operation described on page M 6 IMPOSSIBLE to receive According to the Almanac a satellite is not available in line of sight ACQUIRING a satellite According to the Almanac a satellite is available in line of sight and the GP 1250 is acquiring it but has not received it yet If the ACO state lasts a long time without changing to ALM or 2 D below suspect that satellit
3. AUTO MENU 1 Estimated Latitude 38 30 00 N Longitude 23 30 00 W MENU 2 Date Time Local Zone Time MENU 3 Plotting Interval en MENU 4 Waypoint Display ON Intended Track 1 1 ON MENU 5 005NM OFF XTE 0 05 NM OFF 0 00NM OFF MENU 6 GPS Correction Latitude and longitude 0 00 N 0 00 E Magnetic AUTO Smoothing Antenna Height HDOP Threshold 20 Disable Satellite none MENU 7 Back up function OFF GPS Position Correction Port 1 EXT NAV FURUNO CIF LORAN C Port 2 OUTPUT FURUNO CIF input FURUNO CIF output Output Talker Name 5 COLD START erasing receiving ALMANAC If the GP 1250 has not been used for a long time half a year for example it may not acquire a satellite because the existing Almanac is too old to predict a proper satellite arrival time In such a case perform the COLD START This function erases the existing Almanac and receives a new Almanac Note that extreme error contained in the present time or latitude longitude also causes the said trouble If necessary reenter them referring to pages M 15 thru M 17 CAUTION When the Almanac is erased the GP 1250 searches for a satellite to receive Almanac you can tell your GP 1250 what satellite is presentl
4. Ihe unit prompts you lt QUIT CEVTI gt WPT NO CENT 1 5 2 ENT You will see an event mark entered at the cursor crossing LJ 19 You will see an event mark entered on the present ship s position by LATITUDE and LONGITUDE PLOT Display the plotter screen Y EVT The following prompt appears lt QUIT CEVTI gt WPT NO M i CENTISMARK LSHFTIELL MARKT MARK LAT QUIT CEVTJ w3l w30 W29 v LIEPEIE ITF LIET EC ENT Enter a LATITUDE Select N or S Enter a LONGITUDE Select E or W Switching N S or E W When the unit prompts for entry of a latitude or longitude the 7 key switches the polarity between N and S or between E and W Likewise when you are prompted to enter a signed value you may select or by pressing this key You must press the 7 key before pressing the ENT 20 Erasing indivi PLOT Display the plotter screen LHL 9 Joen Display the cross cursor E 2 Move the cursor crossing onto the center of the event mark which you want to erase 5 CLR The event mark disappears L Erasing all Press MENU 4 and ENT in that order 21 After sailing Operations Suspending track line plotting When your boat is stopped a track line shou
5. OK OK Memory Chips are tested VRAMI VRAMS K OR 4 Input output ports for ext equip PORT NG PORTS PLEASE SET ment are tested For service tech PORT2 NG JUMPERS nician only Don t be surprised if GES 9 27 NG No Good appears it always CARO READ appears unless a special arrange Ki AFTER TESTING ment is made PLEASE TURN THE POWER OFF PLEASE HIT ANY KEY gt INTernal GPS Receiver is tested 123456789ABCDEFGHI JKLMN INT GPS 9 99 9 NG or appears if faulty Refer to the next page for the detail No T tsia Program Ver No NAV Program Ver No Memory Card which is presently inserted is tested Hit keys one by one while PLEASE HIT ANY KEY is dis played If a proper key symbol ap pears the key is normal If any abnormality is reported on the screen call for repair Bear in mind that the self test program does not test all the functions of the GP 1250 Therefore even if everything is OK on the self test screen it does not always mean that your GP 1250 is 100 alright To exit the self test mode turn the power off MAINTENANCE FOR SERVICE TECHNICIANS To test the communication ports run the self test program with jumper leads strapped as illustrated below EXT NAV OUTPUT A TOH gt 1 TD C gt 2 RDH S RDC 4 GND gt 10 OPST gt 13 GND gt 14 gt
6. This BNC N connector is included in 30 50m cable kit APPENDIX Outer sheath Armor Inner sheath Shield 50 30 Hest shrink tube Clamp nut I Clamp Nut Gasket 11000 Aluminum 1 i iTrim mesh at this point Insulator i Trim aluminum at this point Ls Tapered clamp Foil foil In Tre Solder here How to attach N P 8DFB Plug N Remove the outer sheath armor and inner sheath as specified left Insulate the armor with heat shrink tube Cut off the insulator end inner conduc tor by 10 mm and shape the shield as shown left In order pass the cable through the clamp nut washer gasket and tapered clamp Fold bsck the shield mesh onto the tapered clamp and trim its end as shown left Cut the aluminum fcil at four places every 90 degrees Fold back the four pieces of aluminum foil onto the mesh end trim them as shown left Cut out the insulater leaving l mm aniy Cut out the conductor leaving 5 mm only Insert the conductor into the connector pin and solder them together through the hole in the connector pin Insert the connector pin into the shell and screw the clamp nut into the shell Turn the clamp nut only NEVER TURN THE SHELL AP 10 reception only port Diagram is available on Page S 1 Connect an external navaid NMEA 018
7. 20AE X 9401 2 ANTENNA CABLE SET AP 19 E o DWG No 4337 03 FURUNO ELECTRIC 0 LTD F UP UNO BS BR No N A ME T Gc AT H INSTALLATION MATERIALS 000 040 671 20 9402 20 00610 GPSZ7u GP 1250 GPS PLOTTER 4 ES E z 3 EE OUTLINE DESCRIPTIONS QTY REMARKS 004 366 210 CP20 00601 m COAX CONNCTOR L 3 2 2 N P 8DFB CODE No 000 111 549 Tu TT 7Mai ANTENNA CABLE ASSY 2 3 CONNCTOR TuT4T 7W 8d 4 ANTENNA CABLE ASSY NJBP 3DXV 1 000 117 602 NJ BNCP NI 000 123 810 8D FBCY 50 CODE No 000 111 599 CODE No mw CODE No CODE No ANTENNA CABLE SET CODE No FURUNO eg C0 c To A337 FURUNO LLIELL La 7 A T GROUNDING TERMINAL ERAS IR FIXING HOLES MAX 320 RK SSS MAX 280 9 RECOMENDED CLEARANCE Bae DISPLAY UNIT 55 220 pp Wool 855 CA337 GO1 B FURUNO ELECTRIC CO LTD cmi 52 ELE SOS LEE SR 22 24 WHITWORTH FINE THREAD 25 14 NOTE Substitutable with UNIFY THREAD 1 14 U
8. If GPS POSITION CORRECTION page M 28 is performed is not attached Ex GPS LC 25 EYF n 9 E M 2 gt bac 1 e Lal MEMoI wer f pin Pnj n KL HE PLOT pw t PMG MENI MON MENU SCREEN CONVENTIONS Until this chapter you mainly did operations on the plotter screen In the succeeding chapters you will select an item on a text mode screen called a MENU In this section you will learn general rules to select an item on the menu screen The MENU screen contains items which normally do not require frequent adjustment in daily use General rules in selecting an item Press the MENU key and you will see the INITIALIZATION screen appear INITLALIZATION X 13 INITIAL amp LON SETTING CNET EU E 221 DATE TIME amp LOCAL ZONE TIME 23 PLOT INTERVAL PRESET 141 DISPLAY WPT MARKS COURSE WPT MRKS COURSE 208 C51 ALARM SETTING C6 GPS CORRECTIONS 7 INTERFACE PORT BACKUP NAVIGATION 83 COLD START C93 SELF TEST CLEAR DATA BATTERY CHOOSE MENU You have nine choices numbered 1 thru 9 and the GP 1250 is prompting you to select one This is a MENU
9. ALARM FUNCTIONS Various alarm functions arrival alarm cross track error alarm and border alarm are explained MEMORY PARTITIONS This chapter explains how to save display ship s track line to from the internal memory partitions RAM CARD optional This chapter explains how to save reload ship s track line and waypoints to from the optional RAM card MISCELLANEA Daily used parameter settings etc are explained The pages prefixed by M Page M 1 and after contain USE LEVEL MAINTENANCE Troubleshootings etc are explained PARAMETER SETTING GP 1250 s functions are controlled by many parameters You may adjust them to your preference The pages prefixed by AP Page AP 1 and after are intended for service technicians To understand the technical aspect of the GP 1250 it is recommended to read the following chapters To understand the concept of the GPS system and GP 1250 About GPS Page 1 thru 5 install the GP 1250 INSTALLATION PARAMETER SETTING Page AP 1 thru AP 16 Page M 14 thru M 32 To maintain the GP 1250 USER LEVEL MAINTENANCE Page M 0 thru M 13 MAINTENANCE eee Page AP 17 thru AP 20 IMPORTANT READ THIS FIRST Although your GPS Plotter is capable of providing very accurate position data no single navigational device should ever be solely relied upon Position information obtained from the GPS Plotter should always be double checked a
10. GND 14 _ Case 2 EXT NAV OUTPUT ports CURRENT LOOP factory setting 792 1 42 3 4 5 6 51 2 plug off off off ON off ON plug off 2 AP 13 g a lt Replacing the MEMORY BACK UP BATTERY CAUTION Even if the machine is turned off some circuits are kept alive by the back up battery Do nottouch the circuits unless instructed below Shortcir cuit may result in defect of the component or loss of memory contents 1 After disconnecting the power cable put the machine on the table upside down 2 Loosen the four screws and remove the cabinet cover P 4 3 Measure the battery voltage between the BTH and BTL terminals on the GDC 22P0028 board If the voltage is below 2 5 Vdc replace the battery as instructed in the following steps Unless you mind loosing the memory contents you may omit the steps with marks Lithium Battery CR2 3 8 L 080080A 000 119 969 Life 3 years approx 4 In order to hold the memory contents during the battery replacing work temporarily connect a dry battery between the BTH and BTL terminals using leads Any type battery may be used so long as the voltage is 3 to 5 Vdc Be careful about the polarity 5 Cut jumper 1 on the same pc board 6 Remove the battery fixing metal and replace the existing lithium battery with a new one Be careful about the polarity 7 Reconnect jumper JP1 8 Remove t
11. TURN ON OFF 9 i ON 2 OFF CHOOSE amp To display it again use the same keystrokes but enter 1 rather than 2 31 AYPOINT Modifying a waypoint latitude and longitude Re enter overwrite it Deleting a waypoint Waypoints can not be deleted the only alternative is the ALL MEMORY CLEAR described on page M 4 If you want to erase the mark of a superfluous waypoint overwrite the waypoint with zero latitude and longitude 32 Displaying a WAYPOINT LIST After having entered many waypoints you would like to see what waypoints are available in your GP 1250 In this section you will practice the following operations 1 How to display a list of waypoint numbers which are available in your GP 1250 2 How to display latitude and longitude of each waypoint Keystrokes SELECT NAVIGATION NOW NAV OFF The first page of a waypoint E list appears To view the next i page press 22 8 WPTO6O0 PRESENT POSIT PRESENT POSIT NO 08 LA LON 4 2 0 ROUTE 1E p waypoint number of which the latitude and longitude you want to display You will see the latitude and longitude as illustrated below DO NOT PRESS ENT OR WAYPOINT ENTRY MODE IS INVOKED WPT NO 20 0 4 FROM gt TO ROUTE Y CLR CLR L PLOT 33 Selecting FROM and TO WAYPOINTS Suppose that many waypoints are available in your GP 1250 In thi
12. YLO 10107 eO J MW06 06 088 88 31 05 NS3 TIESLOVIWN 2208 79810 Iu HSC 1 06 06 088 98 58 88 08 0L 31 v VI OL NO 01 05 5 EROYIWN 41 r m w O gt Rc HERCLE MUNI ORE R des lt SCLC 18008208 WALL TAE KH fr oEOLO V 3HN 411 k Beto 4 MCOORLOVINN XL ABI X 1i EIS EXT D MON e RE COR LO YN RCO E MCA IE AILENI ESAI PLIMA E LB 522 BURROS ORLO WINN EBLOVINN 4ED LATTE t pd ae LE LES AT PPH BUNS 0 0A1 04 08 HARI THARE 7 Es 163104 300 1 2H09 08 Sti Add ve JY AQZZ 01 001 M09 29 831411238 YNNSINYI 790 asp xu mu EROV3WN JI LINA Av ldSIQ FERE 3107849 tug 64 USE 3608770 Y 85 AN3dS 0 X 2 1900500 Boo 5 use AX DO 5200502 i prp MG EE EI gt ELE MEE T BIN De 2 INNEN Ee Y ETN y LINN VNN3INV EIL 0 49 z d N ECON D F ABC INDEX ok k kk k Almanac ANTENNA HEIGHT chart scale CLEAR DATA COLD START correction course heading cross cursor cross track error cross track error alarm cursor 5 DATE TIME amp LOCAL ZONE TIME DECC DISABLE SATELLITE Distance To Go range
13. PCB CRT APPENDIX PACKING LIST 20AE X 9851 2 0 0 GP 1250 INSTALLATION MATERIALS FETARE 20 00340 3 gt 3m NAME 1 OUTLINE uscuerrvone wj ar wa em 2280015 2 i POWER CABLE m 14 000 109 000 1 DISPLAY UNIT 282 2 1 CONNECTOR s oco m 000 112 144 1 y A Wd 04540801 ANTENNA UNIT 100 080 689 Ga 30 1200 0 3 1 COPPER STRAP vue 000 872 187 dB 5 DERRER v b 1 20 0035 SPARE PARTS DTI 2 1501 i 13 2 b 2 XJBA 0211 _ a it 2 D SUB CONNECTOR 000 111 105 CONNECTOR Y 000 107 770 239972 eS 25 1813 i t a X 20 FGMA 1 He mew 1 CONNECTOR HOUSING ANE Is FUSE 000 111 849 EH E 40CM 2 4 FA eva 2 EMI SHIELDED TAPE Se NS ast He 000 835 089 000 119 976 SHERRE gt 2 CP20 0038 pozos 0901 13 ACCESSORIES D SUB CONNECTOR 000 111 788 1 T T E 60 001 0123 3i gt OR 22 001 0123 1 3A222 F 1500 01 HOD ASSY 100 082 411 CONNECTOR HOUSING s x 248 l 8 amp dy FP20 00501 1 EMIL VET 7 11 BRACKET ASSY 004 029 890 EMI SHIELDE
14. another function called WAYPOINT is available NOTE If you want to know the latitude and longitude of an event mark superimpose the cross cursor on the center of the event mark and read the cursor latitude longitude indication For better pointing accuracy magnify the plotter screen as much as possible Three shapes available Beforeyou enter event marks select a shape as follows It is a good idea to assign A to lighthouses to shoals C to events on a voyage for example The mark shape in use is displayed at the center top of the screen DM Display the plotter screen o m SHFT The mark in use is highlighted 6 lt 2 1 7 EL 1 Call up a desired mark m E CLR The highlighted A rectangle disappears 18 BASIC Display the plotter screen Y H Erase the cross cursor if presented y EVT The unit prompts you as illustrated below lt QUIT CEVTJ gt NO M CENTIJ MARK CSHFTOELL MARK with the pre selected shape at the CURSOR CROSSING Ifyou want to enter more PLOT Display the plotter screen Y 9 Display the cross cursor Move the cursor to a desired position by pressing the arrow keys Lat long on the cursor crossing 34 5 25 N 135 23 4 E 40 28NM Bearing Distance EVT
15. 1250 While the HDOP of existing satellites is lower better than the threshold GPS fix is presented on the GP 1250 When the HDOP becomes worse than the threshold the external navaid fix is presented Such an external navaid is called a BACK UP NAVAID GPS Satellite Arrival Time amp Almanac Until the full complement of GPS satellites is launched it is important to note that limited hours of position fixing is available The period and time differ with respect to geographical location on the earth The time required for a GPS satellite to revolve round the earth is 11 hours and 58 minutes This means that the predicted satellite arrival time in a given area will be 4 minutes earlier each succeeding day 4 min per day half an hour per week 2 hours per month and whole a day per year For example supposing that the satellite arrival time was 3 00 to 5 00 PM today the same satellite will be in line of sight from 2 56 to 4 56 PM tomorrow The position fixing periods also advance 4 minutes a day Every satellite is broadcasting not only its own orbital data ephemeris explained on page 2 but also rough orbital data of all the GPS satellites called the Almanac Therefore the GP 1250 can predict arrival times of all the GPS satellites by receiving a single satellite The GP 1250 acquires receives GPS satellites in accordance with this prediction Unless the Almanac is available in the GP 1250 position fixing is not initiated As the
16. 2 to disable the automatic chart loading function Enter 1 to enable it 63 When the auto loading function is disabled you must load a coastline manually Insert a ROM card into the card slit att PLUG IN 111 THIS FACE UPI KEWEENAW BAY PORTAGE LAKE TORCH LAKE WATER WAY PORTAGE TORCH LK WATER 1000 POINT COASTLINE DATA TITLE Ti i STOCK Digiti ha t Spit nat charts replace es 00 FURUNO ELECTRIC CO LTD MADE IN JAPAN LLLA MC 1 RECALL CHART FROM MEDIA 7 coastline file list appears a1 1496ALL 02 KEWEENAW display the rest of the list 03 PORTAGE press lt gt 84 TORCH LK 05 WATER WY KEY CHANGES PAGE CHOOSE NO ML Y M Enter the 2 digit number assigned to the intended file You may select a coastline which is away from your current area Y Message NOW READING appears on the bottom line Wait until it changes to COMPLETE y PLOT NOTE 1 You do this operation when the auto loading mode is selected as well 2 If a coastline is not displayed on your screen check the following points 64 e Isn t the coastline situated out of the scope of the current plotter screen e Isn tthe picture shrunk and the coastline is out of the scope of the current plotter screen 65 CORREC
17. Connection Kit optional is required This kit includes the plug for GP 1250 end only Procure the cable separately 2 Do not forget to strap a jumper between pin 7 and 8 on GP 1250 3 Ground unused twisted pairs Floating wire causes noise 5 1 CONNECTION OF AUTOPILOT amp COLOR SOUNDER AUTOPILOTS NMEA 01 GP 1250 EN SPEW SB C ipee FAP 30 FAP SC 83 nard length gt m Mat allowable length gt 10 i OUTPUT SRCNEAIC LORAN 2 Hop NMEA XM25 1503 0 SMF AA Da CRN 36 7 amp 80 H 23 Pye l 4 6 90 0 lt 10 GND 56 RD C 512 2 4 lt 10 amp ak ex i I RD H 3 a WHT T RDC 4 BLK GNO gt 10 OPST gt 13 GNO 16 gt COLOR SOUNDERS NMEA 0183 662 4 0 Series MACHINE GP 1250 NMEA Cable FMV 602 250021 fourni m 021 2 m cus XM2 1503 9 YEL 3 4 8PH 3 4 RDH pe x GRN 1522 RDC amp 1 d 00 X 1 amp TDH qn 2 D kode L NOTE 1 The driving capability of this port is 20mA and the number of the units connectable to this port varies depending on their input impendances In the worst case where the input impedance is 500 ohm each specified by NMEA 0183 max two units may be parallel driven HIGH level 4V specified by NMEA 0183 is ensured because the driv
18. During the GPS satellite reception the GP 1250 does not accept your dateltime entry displaying RECEIVING SATELLITE As for the local zone time it may be entered any time 2 When a GPS satellite is received the on screen clock is corrected automatically M 17 u3la3aWvuvd IET or 6 l 1 i i 2 AQeIUopaLeD7N 4 18 3NI1 diva yates 01 6 Entering PLOTTING INTERVALS Two plotting intervals No 1 amp No 2 are available in your GP 1250 and you may use either interval as explained on page 69 In this section you will define two plotting intervals by time or by distance By TIME MENU 3 PLOT INTERVAL PRESET RANGE 5 SE AVAILABLE FOR NO 2 SELECTED B MIN SEC Enter an interval by time 05 10 50 or 55 555011060 PLOT by DISTANCE MENU 3 X PLOT INTERVAL PRESET X 1 ENT for No 1 Interval or 86 3 18 MIN 2 ENT for No 2 Interval THE VALUE FROM 8 801 N M TO Y 8e B ALLOWED IN THE CASE 2 ENT by DISTANCE NO 2 SELECTED 1 miles ENT PLOT Enter an interval by mileage M 20 PARAMETER Erasing displaying WAY
19. ECONOMY event mark G GPS GPS position correction GPS DC GPS DR GPS LA GPS LC GPS OM INITIAL LAT LON SETTING M 15 INT 24 M MAGNETIC VARIATION memory clear memory partition IN overlay sse 55 P parameter plotting interval R S scale SELF TEST T X 2
20. FU RWNM OPERATOR S MANUAL GPS PLOTTER MODEL GP 1 250 g FURUNO ELECTRIC CO LTD NISHINOMIYA JAPAN eFURUNO ELECTRIC C0 LTD 9 52 Ashihara cho Nishinomiya Japan 662 Telephone 0798 65 2111 Telefax 0798 65 4200 i Printed in Japan PUB No OME 43371 CSHNID GP 1250 Your Local Agent Dealer D 1981 F OCT 19 1993 umm WELCOME TO THE WORLD OF THE GPS PLOTTER Furuno Electric Company thanks you for selecting and purchasing the GP 1250 GPS Plotter We are confident you will discover why the Furuno name has become synonyomous with quality and reliability For over 40 years Furuno Electric Company has enjoyed an enviable reputation for quality and reliability throughout the world This dedication to excellence is furthered by our extensive global network of agents and dealers The GP 1250 GPS Plotter is the culmination of a long line of Furuno developments in the field of navigation In one remarkably small cabinet is an unbeatable combination of a professional GPS receiver and virtually all the navigation capabilities most voyagers will ever need Daily used functions are accessible directly by hitting hot keys Because the unit is small there may be a tendency to forget just how sophisticated this machine really is and perhaps to disregard the fact that no machine can perform its intended function unless it is installed properly The desirability of a professional installation and a thoroug
21. GP 1250 is shipped from the factory with the Almanac memorized you may use it immediately after installation Whenever the GP 1250 receives a satellite the Almanac is replaced BASIC LEVEL OPERATIONS CAUTION Engine ignition on small boats sometimes causes a serious supply voltage fluctuation exceeding GP 1250 s tolerance This may result in malfunction of the GP 1250 and destruction of memory contents such as waypoints various parameters which you had accomplished For that reason make it a rule to turn off your GP 1250 before you start the engine GPS Plotter Tutorial Before you get started using your new GP 1250 be sure that the following two important jobs had been completed 1 INSTALLATION described from page AP 1 2 PARAMETER SETTING described from page M 14 In this section you will learn the following subjects which are most elementary portions in the GPS plotter operations 1 Turning the POWER on and off 2 Turning the KEYBOARD BACKLIGHT on and off and adjusting the SCREEN BRILLIANCE 3 Displaying and scrolling a PLOTTER SCREEN Displaying and controlling a CROSS CURSOR Sailing to a cursor pointed location Operate your GP 1250 as you read through the procedure starting from the next page NOTE Keyboard layout is available page 25 START If you have a ROM CARD covering your sea area insert it into the GP 1250 The unit will automatically search the card for a proper coas
22. The GP 1250 transmits a test data and receives it If the received data matches the transmitted one it displays OK Results Antenna not connected SIG block ROM error Local RAM error Common RAM error Chip 1 error Chip 2 error FIX block ROM error Local RAM error Backup RAM error Common RAM error error 8087 error error NAV block ROM error Local RAM error Backup RAM error Common RAM error Battery error External loop back error M 3 ALL MEMORY CLEAR The ALL MEMORY CLEAR function erases all memories in the GP 1250 Use this function when someone has entered a lot of wrong data etc and you want to initialize the memories Note that this operation clears all waypoints which you had entered CAUTION 1 When the ALL MEMORY CLEAR is executed all the memories listed on the next page are cleared or initialized to the default values If required record the current settings in a log so that you can reenter them later Don t forget to record waypoint latitude longitude See page 33 2 After the ALL MEMORY CLEAR operation the COLD START page 24 is invoked automatically i e the GP 1250 searches for a satellite to receive Almanac If you can tell your GP 1250 what satellite is presently available in line of sight it is helpful for the GP 1250 to acquire the satellite smoothly Therefore it is re
23. UNHEALTHY SATELLITE manually M 1 Running the SELF TEST Program M 2 ALL MEMORY CLEAR M 4 COLD START erasing receiving ALMANAC M 6 Replacing the LITHIUM BATTERY in a RAM CARD M 8 MEMORIES SOME ERROR M 10 INT GPS or INT GPS BACKUP DATA ERROR M 11 Q amp A M 12 PARAMETER SETTING Entering estimated LAT LON MENU 1 M 15 Entering DATE TIME LOCAL ZONE TIME MENU 2 M 16 Entering PLOTTING INTERVALS MENU 3 M 19 Erasing displaying WAYPOINT MARK MENU 4 M 21 INTENDED TRACK GPS CORRECTIONS LAT LON Correction MENU 6 1 MAGNETIC Correction MENU 6 2 SMOOTHING MENU 6 3 ANTENNA HEIGHT MENU 6 4 HDOP THRESHOLD MENU 6 5 Adjusting COMMUNICATION PORTS NMEA CIF Turning BACK UP function on off MENU 7 1 Adjusting PORT1 EXT NAV MENU 7 2 Adjusting PORT2 OUTPUT MENU 7 Changing TALKER NAME MENU 7 4 APPENDIX for technicians only Mounting the DISPLAY UNIT AP 1 Mounting Location Mounting Procedure Mounting the ANTENNA UNIT AP 3 Mounting Location eene AP 3 Mounting Methods sese nnne nennen enne nnne rna AP 5 CABLING AP 6 DC IN Replacing the MEMORY BACK UP BATTERY AP 14 Replacing ROM CHIPS AP 16 Maintenance Parts List AP 17 OUTLINE DRAWINGS D 1 to D 3 Connection of external navigator 5 1 Connection of autopilot amp color sounder 5 2 INTERCONNECTION DIAGR
24. a Route For the return trip you would want to reverse the routing direction You may do this by pressing lt when you select a route TO TO TO JEJE 1 ENT Press 27 before you enter a route number and the GP 1250 attaches sign to the route number to acknowledge that the route direction is reversed The plotter screen appears automatically When you want to return the route to the initial direction reenter the route number without pressing lt The sign will be erased Skipping a Waynoi R When your voyage plan has changed and you want to skip a waypoint on a route use the following keystrokes The GP 1250 recalculates the route with the waypoint ex cluded 3 46 Y ENT Enter a route number from which you want to exclude a waypoint ENTER ROUTE X egt D BO NI Gon Wok ROO 4 1 1 Y ENTER 10 WPTS FOR A ROUTE FENTY AUSE WPT LBHFTJ LENTI REMOVE WPT WPT 1 8 2 NEW ROUTE H SERIAL NO Y ENT ENT Press ENT several times until the 2 digit SERIAL NUMBER of an intended waypoint appears on the prompt line Y SHFT ENT The waypoint is deleted temporarily and sign is attached to the waypoint number on the screen You may restore it when desired See the NOTE below or SHFT SHFT ENT That wa
25. at the switching from GPS to the back up navaid as illustrated below 7 X GPS Jump B o a 2 x MERC o 5 Back up o o o 9 If the HDOP threshold is set low and the GPS fix is thought to be more reliable than the back up fix enter 1 ON The back up fix is corrected for better continuity from the GPS fix as illustrated below Enter 0 OFF if you do not need such a correction Back up fix after correction GPS fix x m reliable 1 1 Y 1 ae Correction Value 2 xc 29 9 Back up fix o not so reliable PARAMETER M 28 The EXT NAV is a receive only port If an external navaid is connected declare its specifica tion MENU 7 2 yp PORT 1 SETTING FOR EXT NAV NOW LORAN C FURUNO CIF PORT 1 IS INPUT PORT You MAY ELTHER QI LORAN e EURUN e 1 2 0 3 RUI 1 y 5 LORAN C NMEA 6 7 8 9 CHOOSE M OF BELOW c c c 4 8 8 8 8 Y ENT Select a desired combination of NAVAID and FORMAT and enter its number NOTE EXT Talker ID IT Y PLOT NOTE 1 Forihe NMEA 0183 format the GP 1250 receives the following sentences through the EXT NAV port These data are not received while the internal GPS receiver is active LCGLL TRGLL GPGLL LCVTG DEVTG TRVITG GPVTG DBT MTW may bean arbitrary ta
26. equals one third of the lateral lane width TO WPT track 21 1 1 l 1 i 1 E 1 1 1 1 1 1 1 1 1 1 T Y 1 if Zone Width Zone Width FRI WPT When the ship goes outside the safety lane three marks appear and an alarm is released The Morse coded audible alarms R for STEER RIGHT and L for STEER LEFT Be careful not to confuse them ON PLOTTER NAV INDICATORS You leaned earlier that you can change the size of the on screen indicators By using similar keystrokes you may select data to display You have the following choices A IMN 1 6 5 SPEED or YTD Velocity To TO WAYPOINT Ships or BEARING of TO WAYPOINT 234 5NM i COURSE i or TTG Time To Go to TO WAYPOINT These are factory selected Interpreting the indicators The is ship s moving direction measured by receiving the GPS signal It differs from the compass reading which is merely a ship s bow direction Notice that the ship does not always go in the bow direction She sometimes goes in a squint direction due to waves wind sea stream unbalanced loading condition etc NOTE In the absence of the GPS fix the indicator shows the course information sent from the back up navaid 37 The SPEED is a ground tracking speed in the COURSE direction This is also measured from the GPS signal directly Note th
27. power application the internal lithium battery good for 3 years is used up Call for replacement Q amp A This section provides user level troubleshooting procedures for the troubles which are mainly caused by misoperation Symptom 1 No satellite reception No position fixing 1 Is the PRESENT POSITION reasonable If the error is larger than ten degrees reenter the INITIAL latitude and longitude as explained on page M 15 2 Isn t the HDOP THRESHOLD page M 25 set too low Too low a setting such as 1 causes extremely short position fixing periods 3 Perform the SELF TEST described on page M 2 Are the test results ok NOTE If INT GPS appears check the ANTENNA connector for proper seating on the rear panel 2 Disregard the test results of the communication interfaces described on page M 3 is presented unless the jumper leads are connected 3 If the other errors appear call for repair 4 Are the PRESENT DATE TIME reasonable If not reenter them as described on page M 16 5 Call up the ALERT screen page 8 Isn t the ALMANAC DATE off more than 6 months or older If so perform the COLD START 6 Call up the ALERT screen page 8 Ask another boat having a GPS receiver to call up the similar screen If there is a significant discrepancy between the two the Almanac in your GP 1250 should be faulty Perform the COLD START explained on page M 6 Symptom 2 Position fixing periods are
28. screen To select an item on the menu you have two methods Method 1 Press the numeric key corresponding to the intended item If you want to select 9 SELF TEST for example press 9 GP 1250 instantly responds to display the screen which is specific to the selected item 26 Method 2 Press the down arrow key several times until the intended item is highlighted INITIALIZATION X 111 INITIAL LAT amp LON SETTING Lai 98 38 8878 CON 123301069 121 DATE TIME amp LOCAL ZONE TIME 3 PLOT INTERVAL PRESET 41 DISPLAY WPT MARKS COURSE WPT MRKS ON COURSE ON C53 ALARM SETTING 153 GPS CORREC i TONS 7 INTERFACE PORT BACKUP NAVIGATION 1 By CLEAR DATA BATTERY CHOOSE MENU Then press ENT and the screen specific to the selected item appears In this sample operation select 9 SELF TEST and the following screen should appear SELF TEST CLEAR DATA BATTERY 117 SELF TEST C2 CLEAR DATA 31 EXCHANGE BATTERY HAM CARD 41 FACTORY TEST MODE CHOOSE MENU 7l Continue selection of item until you reach the screen in which you can enter data If you want to quit from a text screen without entering data simply press PLOT 27 NOTE When you select an item on a menu you may use both down and up arrow keys Each time you press the up arrow key the highlighted rectangle goes upwards When it reaches the top item pres
29. screen is expanded Therefore you would have to compromise between a long track line and precise plotting Ifyou want you may change the values in the No 1 and No 2 intervals from the default values 5 amp 10 min See page M 19 69 PLOTTER ONLY MODE When the built in GPS receiver is faulty you would like to use your GP 1250 as a video plotter for the external navaid only Use the following keystrokes resulting that the internal GPS receiver is totally disabled and the GP 1250 operates as a display device for the external navaid PLOT M 6 8 SHFT SHFT SHFT I GPS is highlighted Y E Jeees The type of the external navaid appears GPS Internal GPS External GPS LRN A External LORAN LRN C External LORAN C External SATNAV TRANSIT External DECCA External Device Talker Name II To enable the internal GPS receiver again call up I GPS LO D S The highlighted rectangle disappears NOTE If a data is not transferred from the external navaid RCV ERR appears and blinks RCV ERR 70 USER LEVEL MAINTENANCE k k RRR KR KR KR KR KR KR MAINTENANCE Deselecting an UNHEALTHY SATELLITE manually Every GPS satellite is broadcasting the abnormal satellite number s By receiving this information the GP 1250 eliminates a malfunctioning satellite from the GPS receiving schedule When the satellite has restarted normal operation a
30. than SATNAV s 399 968 MHz This means that you should be very careful about obstructions Frozen water spray heavily sticking to the antenna surface may interfere with reception Locate the antenna where it will be free from water spray Locate the antenna where pitching and rolling effects are minimal otherwise speed and course readings may be influenced Mast top mount is optimum for GPS reception but is poor for measurement of speed and course APPENDIX When installing the GPS antenna separate it from the other antennas Select a place which satisfies the following limitations Whip Antenna Receiving only Whip Antenna VHF etc Loop Antenna Transmitting Whip Antenna MF HF BAND INMARSAT ANTENNA o o4 9 fol 2 5 0 1 ANTENNA d Wwe tre _ Se Transmitting Antenna Main Mast BAND More than 0 5m More than lm more than 2m preferable More than 4m More than 1 5m not place in the radar beam usually 30 to 40 More than lm OOOOO Distance depends on the diameter of the steel pole More than 1 5m if 9 lt lOcm More than 3m if OJ 30cm More than 3m More than 5m NOTE The requirements for GPS antenna separation are not so restrictive as SATNAV s because the GPS employs a sophisticated communication system strong against inter ference Nevertheless you should separate the GPS antenna sufficient
31. the NAV and ALERT screens alternately By pressing the DIM key turn the KEYBOARD BACKLIGHT on or off KEYBOARD CONVENTIONS 1 When you press a key the GP 1250 acknowledges it by releasing a peep 2 When the unit detects invalid key operation it releases two peeps Press a correct key Adjust SCREEN BRILLIANCE E control In order to display the PLOTTER SCREEN press the PLOT key You should see a graphic screen with latitude and longitude grids overlaid on it Across the screen center a warning should read PLOT OFF NOW ON PLOT AGAIN I mani This means track line plotting is now disabled to prevent false track line plotting If the back up navaid is in a stable condition false latitude and longitude information may be transferred to your GP 1250 filling the screen with false track lines Date Ti 08 24 90 2 16NM SMIN I GPS ime 09 16 015 MAGV Page M 16 32 59 35 N 7 129 29 04 E Irack Line You should see a large dot is blinking every second It is your SHIP S MARK and its latitude and longitude appear here E Y If a back up navaid is available place it in the fully operating condition Be sure that the PRESENT POSITION latitude and longitude reading is reasonable If it differs from the actual position by more than 10 degrees GPS position fixing
32. you want the audible alarm or 2 if you don t PLOT NOTE In the routing navigation the FROM and TO WAYPOINTS are changed each time the boat breaches the arrival alarm range 50 CROSS TRACK ERROR Alarm MENU 5 2 gt ALARM LIMIT 80 05 SOUND OFF LIMIT N M 1 E 1E JIENT Enter an alarm range NM Enter 1 if you want the audible alarm or 2 if you don t Y PLOT 51 BORDER Alarm Enter two waypoints on the border line and select them as FROM and TO WAYPOINTS MENU 5 3 s a ix BORDER ALARM 0 08 Y HENT Enter an alarm range NM ENT Enter 1 if you want the audible alarm or 2 if you don t PLOT 52 MEMORY PARTITIONS As the following figure illustrates the GP 1250 can memorize up to 4423 1800 1524 99 1000 points of geographical locations as track line event marks waypoints and coastline from a ROM card Ship s Track Line 2 1800 points max Event Marks 1524 points max Coast Line ROM card 1000 points max The hatched area in the above figure stores present positions track line and event marks and is divided into three equal partitions D 2 3 as illustrated below The present positions from the built in GPS or a bac
33. 0 10 57 1614 press 57 4 21 KEY CHANGES PAGE CHOOSE NO M i 2 Enter the 2 digit number assigned to the intended file label and the GP 1250 will prompt you for confirmation ENT Press ENT to say Yes Y PLOT 60 Saving reloading WAYPOINTS Insert a RAM card into the card slit Y MC 3 STORE WPT DATA INTO MEDIA X FILE NAME DATE SIZE amp MEMO A waypoint file list appears 81 w 0001 03 27 90 10 56 1614 02 W_1989 03 27 90 10 57 1614 display the rest of the list W 1990 03 27 90 10 57 1614 press lt gt 1 KEY CHANGES PAGE FILE NAME ON MEDIA Y JE 1E 1E JIENT Enter 4 digit Jabel number for a new file The GP 1250 automatically adds prefix W__ meaning Waypoint to the 4 digit number Y PLOT Insert a RAM card into the card slit t RECALL WPT DATA FROM MEDIA MC 61 2 ennt gt ILE NAME DATE SIZE amp MEMO A fil li 81 01 63 27 90 10 56 1614 waypoint list appears 02 W 1989 03 27 90 10 57 1614 83 1990 03 27 90 10 57 1614 display the rest of the list press lt gt 1 Cg KEY CHANGES PAGE WPT ON WILL BE CANCELLED CHOOSE FILE NO Y 61 mn Y TD 1 ENT Enter the 2 digit number assigned to the intended file CAUTION When ENT is pressed the GP
34. 1250 ERASES all the existing waypoints to make room for the reloaded ones Be careful that waypo nts used for waypoint or routing navigation are also erased PLOT Insert a RAM card into the card slit Y MC 7 a ERASE WPT DATA ON MEDIA FILE NAME DATE SIZE amp MEMO A waypoint file list appears 01 0001 03727790 10 56 1614 92 W 1989 03 27 98 10 57 1614 display the rest of the list ni W 1990 93 27 90 10 57 1614 press 271 t 1 CE KEY CHANGES PAGE 1 CHOOSE NO e ENT Enter the 2 digit number assigned to the intended file label and the GP 1250 will prompt you for confirmation Y ENT een Press ENT to say Yes Y PLOT 62 MISCELLANEA Loading a COASTLINE from a ROM CARD manually A ROM card usually contains coastlines in several different areas If a ROM card is inserted into the card slit the GP 1250 searches the ROM card for the coastline file which matches your current area When the correct file is found it is loaded automatically replacing the existing coastline data If a proper file is not found or if a ROM card is not inserted the GP 1250 displays CHART as illustrated below CHART If you wish you may disable the automatic chart loading function MC 9 eene gt CHART SELECTION NOW AUTO 2i MANUAL CHOOSE amp Y 2 ENT Enter
35. 3 or FURUNO CIF to this port NOTE 1 Don t forget to strap a jumper between the 7 and 8 pins on this connector At the power on the GP 1250 examines the jumper connection Unless a jumper connection is detected it does not receive data through this port 2 If a external navaid requires a DSR input couple it to its own DTR output Otherwise transmission is not initiated Back up Navaid 3 To connect an RS232C equipment see the next page transmission reception port Diagram is available on Page 5 2 Connect peripheral devices such as color sounder autopilot etc This port transmits naviga tional data and receives water depth and temperature information Transmission FURUNO CIF or NMEA 0183 or NMEA 0180 Reception FURUNO CIF or NMEA 0183 NOTE 1 Do not forget to strap a jumper between the 13 and 14 pins on this port Otherwise the GP 1250 will neither transmit nor receive data through this port 2 If you want to receive data from an external device which requires a DSR input connect the DSR to its own DTR output 3 To connect an RS232C equipment see the next page APPENDIX Modification for RS232C Interface The EXT NAV and OUTPUT ports may be interfaced with an RS232C machine by adding the following modification NOTE This modification does not affect data sentences which are input or out from the GP 1250 Only the physical characteristics of the signal are changed from the 20mA cur
36. 3 satellites are in line of sight 1 GPS satellites continually transmit their own precise orbital data called ephemeris The GPS receiver computes their locations by receiving these data 2 In the above mentioned receiving process the GPS receiver measures very accurate distances to the satellites using what is known as spread spectrum modulation Excel lence in GPS s position fixing accuracy is mainly due to this technology 3 Satellite locations and their distances are known already Now the GPS receiver fixes its own position by triangulation 1 Satellite locations are calculated Sa d 2 Distances are measured RU Se 3 GPS fix is calculated as the meeting point of three spheres which are drawn around the three satellites with diameters 41 d2 and 43 Position fixing Accuracy HDOP and Back up Navaid As you may have noticed GPS fix is obtained in the same manner as the position fixing which is conducted on the radar by using the VRM variable range marker The following figures show a radar screen and sea chart A B and C are known locations lighthouse cape etc and the distances to those targets are measured on the radar screen by using the VRM The own ship location is fixed as the intersection of three circles which are drawn with the diameters of VRM readouts centering around A B and C In case of GPS A B and C correspond to satellites As exper
37. 900522 ASSY 318v 79401140 NNIW NO ESLOY3HN 31 3IVNHLTV 3NIHONH C50 N30 2 rx exi gt 3NIH2 Y 8L0V3WN poke OBLOV3AN SI XI NSHM 38 NV VIVO ON JHL ATLJNX3 34v XL X1 30 1091 0 JHL VIVO 549 3AI2D34 LON NYJ 804 J OL SdD CIONVH 38 NV S34 IV NSH NO OgLOV3HN YO EBLOWaWN di SNOWY INO 113135 SIE VW NOLLY TIVISNI SY 03410005 01400 801298801 N INS HOV1iV WOS 0E AL AYI SHI 31 3 Ol vM 404 S3dVL ONIM Q3830105 A8013V4 133479 TEV AdIHS 153 gt jo o Lm Ab 2 rw CE medi n n 1 XVW uS 0191 WoL 1857443450 Donen z gt WoL gt ra wor 209 AWS 299 AD4 2045 24 n d d 21200972 318v W3UNDnOS 030A BW gt PXU ER egov awan EH x i wx Hout AALY De xy moved S a 735 JOS MS OLS ANH YW SS dYJ ESLOVIWN 0S dv4 E sam 0 4 ONUS Urge Y s ads EBLOV3MN U 936434 3406 06 088 88731 05 NSJ ATUC 1 YS
38. AM 5 3 SCHEMATIC DIAGRAM 5 4 X 1 to X 2 About GPS How GPS works GPS is an acronym meaning Global Positioning System The Global Positioning System also known as NAVSTAR is a precise satellite navigation system developed by the U S Depart ment of Defense When full global coverage becomes avail able a constellation of 24 satellites in cluding 3 spares emplaced in nearly 20 000 kilometer high 12 hour circular orbits will provide highly precise con tinuous worldwide all weather position plus time and velocity information to user equipped land vehicles marine ves sels and aircraft GPS vs TRANSIT amp LORAN C Many people surmise that GPS is similar to TRANSIT since the position is fixed by receiving satellites However as detailed in the following table it is quite different from TRANSIT but is rather similar to LORAN C It might be called Loran chains in the sky GPS TRANSIT satnav Position can be fixed con tinually while the ship is in the loran chain covera However note should be taken that GPS fix is obtainable by receiving any 3 satellites There is no specific combination requirement unlike LORAN C where the master and slave combination is fixed How GPS fix is obtained As mentioned earlier GPS satellites are not geostationary They are orbiting the earth as illustrated on the preceding page Position is repeatedly fixed through the following three steps while any
39. D Enter a HDOP threshold 01 to 99 a PARAMETER Adjusting COMMUNICATION PORTS NMEA CIF As explained on page 4 the GP 1250 is provided with a back up function which switches automatically between the built in GPS receiver and an external navaid tied to the EXT NAV connector You may turn on or off this function as follows NOTE 1 The default setting is OFF If an external navaid is connected and you want to use it as a back up navaid turn the back up function on 2 Even when the back up function is turned on you may use the external navaid continually with the built in GPS receiver entirely disabled This feature is useful when the built in GPS is defective and you want to use the GP 1250 in the plotter only mode See page 70 for further information On the other hand if the back up navaid is failed disable the back up function Your GP 1250 works in stand alone mode MENU 7 1 enne X BACKUP NAVIGATION X BACKUP NAV POSIT CORRECT OFF ECT NAVAIO FORMAT ON T 1 SETTING FOR 1 SCREEN BACKUP NAVIGATION ON OFF 1 ON 2 OFF CHOOSE Y ENT to enable the BACK UP function 2 ENT to disable the BACK UP function M 27 PLOT GPS POSIT CORRECTION ON OFF 1 QN 2 OFF CHOOSE Usually a constant difference exists between GPS and back up fixes This causes a jump of present position
40. ED JK PBB 1 FP20 00502 1 ERRES CP20 00060 ye KNOB BOLT ASSY LNA EET PURE TAA BB 3DXY L 15N 2 ANTENNA CABLE ASSY HR B b 22 001 0202 1 i 000 120 325 GASKET gt 100 082 401 2 2612 2 IRSE AIRY 20 6 x 20 515304 4 HOSE CLAMP 000 803 218 gt es TAPPING SCREW 000 800 414 mo ft M B5 A 20 05 3101 1 syay INSTALLING SPACER M6 SUS304 100 150 540 FLAT WASHER cS Tein 7 ux MILL EM SELF BONDING TAPE amp Y 1 00 800 985 3 2 RAMTLFROLONED ET 3 FOOD ASSY For export version is as shown below EI h 1 NO 38D so 0 2 19x 10000 Du rany BLK 1 m 2 9 FP22 00140 VINYL TAPE 15 3 000 835 215 HOOD ASSY I X2 CP20 00560 PUFFS TAS BB 3DXV L 16N 1 20 d 1 1 2 Antenna materials are subject to selection ANTENNA CABLE ASSY according to the specification 4337 202 18 000 120 325 7 eA 19 7 0 5x19x5M 82 1 SELF BONDING TAPE 000 800 885 9 7 0 360 0 2 x19x 10000 BLK 1 VINYL TAPE 000 835 215 Ha BR INSTALLATION MATERIALS CODE No 000 040 670 CP20 00600 P GPSZu P EH 2 gt COAX CONNCTOR gt gt ANTENNA CABLE ASSY BS OUTLINE NJBP 3DXV 1 3D XV 1M9 7 ANTENNA CABLE ASSY
41. ISES o en HDOP at present moment p WE RU E L 1 85758 83 46 of Normal Satellites V CONDITION ODE ELY GZM List of Abnormal Satellites 985 Your GP 1250 is able to X ALMANAC DATE amp TIME discriminate abnormal satellites 63726798 14 34 24 5 and exclude them from reception OFFSET FREQ X 0 HZ schedule The existing Almanac was received on this date time SV xx means the satellite Space Vehicle number from which the GP 1250 received the Almanac List of GPS SATELLITES under reception Inthe upperleft portion of the ALERT screen you should see a GPS Position Fixing Schedule up to 6 periods within 24 hours If appears as a starting time it means that your GP 1250 is performing GPS position fixing now The middle portion of the ALERT screen offers a List of GPS Satellites which your GP 1250 is receiving now If TRK appears under the MODE column it means that the GP 1250 is receiving that satellite for position fixing Don t worry if you don t understand the other columns because they are intended for technicians NOTE 1 You may have noticed that PF Power Failure warning appears at the lower righthand comer of the screen If this warning appears at power on it does not mean equipment fault It disappears when you press a key 2 You may display the ALERT screen at any time by pressing the MON key Note that repeated pressings of this key display
42. NS 188 3000 3100 WE GP 500MARK 2 PAT NAY 3 4 CCHORSIME GP 1250 70 70MARK 2 June 4 9 S1 2 A 5 APPROVED T Nakano TITLE June 4 4 91 GPA 014 N Sato ANTENNA UNIT E June 4 4791 g DRAWN S Nishi pwano 4344 602 FURUNO ELECTRIC CO LTD CONNECTION OF EXTERNAL NAVIGATOR Cable CO SPEVV SB C 0 2 X 5 P or 04541670 Standard length 5m Max allowable length 10m LC 70 GP 300 GP 1250 FSN 70 ON 10 EXT SRCN amp AIG t0P gre 1 TO ia HIOP SHF AA SRONGAI6 I0P 28 016 2 T 1 TO H 1 f 1 I 3 ROH ro cb 2 Ht E D cba y Ever Pl ree t FO DSR H D 7 OSRH gt 7 DSRH 2 7 eu 5 c gt e 5 a X E osca P veL 2 U d DTRC 10 5 10 X nod 10 X 9 4 ot 7 G EPST 8 GND GP 1250 LC 80 85 88 LC 90 X 3 NMEA 42183 MACHIN Cte TH iE AM2A 0j01 SRCNGAIG IOP prr 2 c TD C TOH gt 1 TD 8 2 f GRN LX 26 mc 23 mi TNNG 2 19 5 40 86 0 1 EPST 8 GNO GP 1250 FSN 50 FSN SO NMEA 0 183 1 xM2 030 K 7 3 1 ROH NOTE 1 OP22 2
43. P 1250 transmits the backup data with the talker name GPS In this case the GP 1250 asserts an error flag in each sentence such as XTE in order to signal that the data is not from the GPS receiver The following sentences are transmitted from the OUTPUT port GPGLL GPVTG GPAAM GPWPL GPBOD GPBWC GPXTE GPDBT GPMTW GPRMB GPRMC GPZDA If the external device does not accept GPS data you may change the talker name See the next page for further information If the GP 1250 is operated in the plotter only mode as explained on page 70 the same sentences are output but with the talker name of the external navaid 2 If NMEA 0183 is selected as an input format the GP 1250 receives the following sentences MTW DBT may be an arbitrary talker ID M 31 Because GPS is a recently developed system some equipment can not receive GPS data If this is the case the GP 1250 can transmit all the sentences GPS Back Up with a conventional talker name which the external equipment can accept MENU 7 4 s gt TALKER NAME FOR OUTPUT DATA AME FOR GPS BACK TTER ONLY MODE YPASSED WITH NAME SELECT TALKER NAME 1 GPS 2 LORAN C 3 LORAN A NNSS 4 5 DECCA CHOOSE B Y 1 ENT to transmit all data as GPS data Talker name unchanged to transmit all data as LORAN C data PLOT PARAMETER APPENDIX kkk Ck kk kkk k for technicians only INSTALLATION Mo
44. POINT MARK INTENDED TRACK When you enter a waypoint the GP 1250 displays a small cross at the waypoint location on the plotter screen Also when you use the waypoint or routing navigation function the GP 1250 connects the FROM and TO waypoints with a broken line If you do not need these marks you may suppress their display MENU 4 1 MM m9 OK DISPLAY WPT MARKS ON OFF NOW ON TURN ON OFF ON 2 OFF CHOOSE PLOT MENU 4 2 o 8 Og DISPLAY COURSE ON OFF NOW ON TURN ON OFF 1 ON 2 OFF CHOOSE B M 21 PLOT M 22 PARAMETER GPS CORRECTIONS See page 66 See page 67 When the PRESENT POSITION or SPEED COURSE readings fluctuate randomly you may stabilize them MENU 6 3 z SMOOTHING X NOW LATZLON SMOOTHING SPEED SMOOTH ING d SMOOTHING IN 10 STEPS 8 TO 9 LATZLON SMOOTHING B Enter an index 0 to 9 for POSITION smoothing When the HDOP or receiving condition is unfavorable the GPS fix fluctuates randomly This fluctuation may be reduced by smoothing averaging the raw GPS fixes as illustrated below Lat p raw data m after smoothing Long The higher the setting the more smoothed are the raw data If the setting is too high the response of the latitude longitude readings becomes slow This
45. TIONS Each paper chart is made based on a latitude longitude system called a geodetic system Each country has a different geodetic system and this means that the latitude longitude system employed in your chart may slightly differ from the other s or perhaps from the GPS fix displayed on the GP 1250 In this case the latitude longitude readings on your GP 1250 may be a yacht club house on your paper chart for example though the boat is moored in a harbor Measures to compensate for this difference is furnished in the GP 1250 If a constant error is observed in the latitude or longitude reading of a GPS fix compensate for it as follows MENU 6 1 gt LAT LON CORRECTION NOW CORRECTION TO LAT LON CORRECTION TO LAT M _ N Y ENT Enter a latitude offset value A Select NorS CORRECTION LON I E EJ H PIZ ENT Enter a longitude offset value A Select EorW PLOT NOTE When a non zero value is entered L L latitude longitude appears L L 66 Because the magnetic north pole is slightly deviated from the true north pole a small difference always exists between the true and magnetic bearings This difference called a MAGNETIC VARIATION differs with respect to sea areas on the earth The GP 1250 automatically computes a magnetic variation applicable to your latitude lon gitude coordinate and displays magnetic b
46. about Plotter Screen 22 Summary of ON SCREEN INDICATORS About NAV STATUS Indication 26 Entering WAYPOINTS by LAT LON at PRESENT POSITION at CURSOR CROSSING Displaying a WAYPOINT LIST 33 Selecting FROM and TO WAYPOINTS TOJ TO TO 34 Plotter aided Navigation 36 CROSS TRACK ERROR 36 ON PLOTTER NAV 8 nnne tanen 37 Displaying a NAV DATA SCREEN MON 40 Exiting the Plotter aided Navigation TO 0 0 ENT 41 ROUTING NAVIGATION Entering a ROUTE 2 24 Selecting a ROUTE TO FO J 4 MORE ABOUT GP 1250 ARRIVAL Alarm MENU 5 1 50 CROSS TRACK ERROR Alarm MENU 5 2 51 BORDER Alarm MENU 5 3 52 Saving ship s track line MEMO 1 54 Overlay 68 Formatting a RAM card MC 8 57 Saving reloading SHIP S TRACK LINE EVENT MARKS 58 Saving MC 2 ee Reloading MC 4 Deleting MC 6 sese Saving reloading WAYPOINTS 61 Saving Reloading Deleting Loading a COASTLINE from a ROM CARD manually MC 1 63 CORRECTIONS 66 LAT LON Correction MENU 6 1 66 MAGNETIC Correction MENU 6 2 67 Selecting a PLOTTING INTERVAL PLOT SHFT SHF gt 69 PLOTTER ONLY MODE PLOT SHFT SHFT SHFT 70 USER LEVEL MAINTENANCE Deselecting an
47. as possible because this setting affects GPS position fixing accuracy NOTE 1 foot 0 3 meter 1 PLOT HDOP varies as time elapses While HDOP is better lower than the threshold GPS position fixing is performed When HDOP becomes worse higher than the threshold position information sent from the back up navaid is used You will learn in this section how to enter the HDOP threshold If the threshold is set low GPS position fixing is performed only when high accuracy is expected Trade off for a low HDOP threshold setting is short GPS position fixing periods e g long back up periods Setting of 03 to 04 should be suitable for high accuracy GPS fix Unless a back up navaid is available a higher setting 10 or 20 for example is preferable because GPS fix is obtainable for longer periods Call up the ALERT screen MON with various HDOP threshold settings and you can see how GPS position fixing periods are influenced Note that it will take several minutes until the GP 1250 calculates displays the ALERT based on the new HDOP threshold NOTE 1 If the back up function is disabled GPS position fixing is performed regardless of the HDOP value so long as 3 satellites are available in line of sight 2 Relationship between HDOP value and error in distance is available on page 4 M 25 MENU 6 5 s gt T ENT Y PLOT M 26 HDOP THRESHOLD RANGE 91 TO 99 HDOP THRESHOL
48. at the value may differ from the speed log reading because the log merely displays a water tracking speed in the ship s fore aft direction NOTE In the absence of the GPS fix the indicator displays the speed information sent from the back up navaid When the COURSE ship s moving direction is deviated from the TO WAYPOINT direc tion ship s SPEED can be broken into the following two components SPEED The speed component in the TO WPT direction D is called a Velocity To Destination or Component 2 which makes a right angle with 1 increases the cross track error The BEARING is the direction of the TO WAYPOINT observed from your boat If the COURSE agrees with the BEARING it means that your boat is sailing towards the TO WAYPOINT The is the Distance To Go i e the mileage between your boat and the TO WAYPOINT The Time To Go or indicates how many hours it takes until your boat reaches the TO WAYPOINT The GP 1250 calculates this value based on the assumption that present COURSE and SPEED are maintained If they change the TTG also changes 38 How to select indicators PLOT Display the plotter screen By pressing SHFT move the highlighted rectangle on to the item which you want to change for instance SPEED To change the item press gt LJ MIN 1 GPS MAGV 2 34 23 15N 135 23 15E 2 gt 10 5 Y Wh
49. can not start Enter estimated latitude and longitude as explained on page M 15 Now is a good time to start plotting Press the PLOT key again and you will see the warning message erased and track line plotting started if the boat is sailing and position fixing is being performed Interpreting On screen Indications 4 figure on page 23 illustrates all the indications which appear on the plotter screen Don t worry if you don t understand everything on the screen or if anything in the figure does not appear on the screen The meaning of each indication will be explained in the later part of this manual This section explains several indications which are most commonly used and yet most important 08 24190 ZZZZA TH TP the hatched area to tell you what the GP 1250 is doing No Back up Navaid 2 D asse GPS position fixing with normal grade of accuracy GPS position fixing with inferior accuracy Others GPS position fixing is not performed The PRESENT POSITION is frozen 2 GPS position fixing with normal grade of accuracy ji The BACK UP NAVAID is used These two letters indicate what type navaid is in use LA LoranA LC LoranC DR Satnav DE Decca PRESENT POSITION appears here From the NAV STATUS indication you know where these latitude and longitude infor mation is coming fr
50. com mended to find satellite numbers on the ALERT screen page 8 before you start the all memory clear Note that once that all memories are cleared a satellite number can not be displayed on the ALERT screen MENU 9 2 gt CLEAR DATA X RN OFF THE POWER TO ALL MEMORIES QUIT FUNC KEY gt Y Turn the power off by pressing PWR and OFF simultaneously Now memories in your GP 1250 are cleared initialized MAINTENANCE Reenter the memory contents if necessary referring to the PARAMETER SETTING chapter Don t forget to enter estimated latitude longitude page M 15 or GPS recep tion can not be initiated If your boat is in California USA you are exempted from the latitude longitude entry operation because the default latitude longitude coordinate is California If you have a satellite number which is now available in line of sight proceed to the COLD START on the next page If not display the ALERT screen page 8 and wait until the Almanac Collection Date appears It will take several tens minutes even if there is a satellite in your area DEFAULT SETTINGS PLOT Piot Interval No 1 5 MIN Navaid I GPS MEMO Track Line Event Marks All partitions cleared WPT Waypoints Routes esee Cleared TO Navigation nennen OFF MC Coastline Data sse Cleared Coastline Entry Mode
51. e signal is not received normally Receiving ALMANAC According to the Almanac in the GP 1250 3 satellites are not yet avail able in line of sight Since position fixing can not be done the GP 1250 is receiving Almanac GPS Position Fixing According to the Almanac 3 or more satellites are available The GP 1250 is performing GPS position fixing but the HDOP is inferior to the preset HDOP threshold GPS Position Fixing 2 D 2 dimensional The HDOP is superior to the HDOP threshold Position fixing INTERRUPTed Reception is interrupted due to objects around the GPS antenna etc Ac cording to the Almanac HDOP is still superior to the HDOP threshold When the lost satellite reappears 2 D position fixing will be resumed 24 Indication Navaid in use 2 D Position fixing by GPS 2 D 2 dimensional The is superior to the preset threshold GPS DR Back up by external SATNAV TRANSIT GPS LC Back up by external LORAN C GPS LA Back up by external LORAN A GPS OM Back up by external OMEGA GPS DC Back up by external DECCA RCV ERR No data coming from the back up navaid NAV ERR Data are coming from the back up navaid but information necessary for back up is not contained SIG ERR Necessary data are coming from the back up navaid but with the error sig nal asserted
52. e next line segment The following figure illustrates the FROM and TO WAYPOINTS which are used to travel each segment WPT 10 WPT 11 On FROM 10 T 1 Tu 277 FROM FROM 1 WPT 00 7 fo 90 TO 12 WPT 12 In order to switch the FROM and TO WAYPOINTS the GP 1250 is continually cal culating the Distance To Go which you may read on the plotter screen When the DTG gets shorter than a threshold the unit recognizes that the ship has arrived in the TO WPT resulting in changeover of the FROM TO WAYPOINTS By using the following keystrokes you may enter the threshold mileage Do not enter such a short threshold that your boat can not clear Otherwise FROM and TO WAYPOINTS are not switched The default value 0 05 nm is most commonly used MENU 5 1 ARRIVAL ALARM Y 1 E 1E Enter a threshold mileage i 1 ENT or 2 ENT If you enter 1 the GP 1250 will peep each time your boat reaches a TO WAYPOINT If you do not need a peep enter 2 Y PLOT 45 As explained before you may travel each segment in the same manner as the waypoint navigation The following three functions described in the preceding chapter are fully supported in the ROUTING NAVIGATION as well Plotter aided Navigation Page 36 Displaying NAV DATA SCREEN Page 40 Exiting the plotter aided Navigation Page 41 Reversing
53. earing appears Cursor regardless of the magnetic variation setting on page 67 Be careful if you are using a magnetic compass In order to sail to the cursor pointed location steer the helm as follows e Ifthe compass reading is SMALLER than the bearing of the cross cursor steer RIGHT zo AI XT GP 1250 COMPASS 16 e Ifthe compass reading is GREATER than the bearing of the cross cursor steer LEFT 2185 58 1686 lt 222 1250 COMPASS If you keep steering the helm in the above manner you will reach the destination in the shortest path This method is used for short range sailing only because of its simplicity You will learn a more sophisticated method in the WAYPOINT NAVIGATION chapter 17 Entering EVENT MARKS When you meet your partner boat in the mid sea you would like to put a mark at the present position on the plotter screen This kind of mark is called an EVENT MARK You may enter an event mark by simply pressing the EVT key with the cross cursor erased If you press the EVT key with the cross cursor presented an event mark is entered on the cursor crossing Also you may enter a event mark by specifying latitude and longitude You may enter up to 508 points of event positions An event mark is merely a landmark You can not read its exact latitude longitude later nor can select it as a destination For such a purpose
54. earings If you wish you may disable this function In this case you must consult with your sea chart to find a proper magnetic variation and enter it manually as described on the next page For accuracy manual entry of magnetic variation is preferable because the magnetic variations written on a sea chart are usually more reliable than the automatically computed ones Selecting an AUTOMAIIC or MANUAL mode MENU 6 2 MAGNETIC VARIATION MAG V 7 WEST 1 AUTO 2 MANUAL CHOOSE M Y 1 ENT Enter 1 for the automatic mode 2 ENT Enter 2 for the manual mode PLOT 67 Enteri caia i If the manual mode is selected in the preceding page enter a magnetic variation manually MENU 6 21 2 ENT MAGNETIC VARIATION Select a MANUAL mode MAG Vs 7 WEST MANUAL 7 MAG VARIATION WEST 1 1 ENT Enter a magnetic variation Select East or West If you are using a GYROCOMPASS enter zerroes You will see TRUE BEAR INGS displayed Y PLOT When a magnetic variation non zero value is entered whether it be done automat ically or manually the GP 1250 displays MAG V to tell you that all bearings you read on the GP 1250 are MAGNETIC bearings It disappears when true bearings are dis played MAG V NOTE The bearing of the cross cursor is always tr
55. em entered on the upper left portion of the screen PLOT How to modify a route Reenter overwrite the route How to delete a route Routes can not be deleted the only alternative is the ALL MEMORY CLEAR described on page M 4 How to delete a waypoint from a route See page 46 43 Selecting a ROUTE Tell the GP 1250 the route number which you want to travel Keystrokes TO TO TO Press the key three times The route list appears SELECT NAVIGATION X NOW NAV OFF RGUTE NO NO REVERSE ROUTE E KEY ROUTE NO M 4 FROM gt TO ROUTE WPT G gt TO oD Y T ENT Enter a ROUTE No which you want to travel Y A second later the plotter screen appears automatically Note that the ship s position at this moment is entered as WPT No 00 and is selected as the FROM WAYPOINT The TO WAYPOINT is the first waypoint on the selected route Don t worry your GP 1250 does all these things by itself Suppose that you travel the route illustrated below The FROM and TO WAYPOINTS are initially WPT No 00 and WPT No 10 respectively To go to the TO WAYPOINT you do it by using the Plotter aided Navigation explained on page 36 77 00 FROM 177 10 10 T0 WPT 00 27 Ss WPT 12 44 When you reach the TO WAYPOINT WPT No 10 the GP 1250 automatically switches the TO and FROM WAYPOINTS in order to travel th
56. en the job is over press CLR The highlighted rectangle disappears 39 AYPOINT Displaying the NAV DATA SCREEN The NAV DATA screen offers complete navigational information on one screen At every press of the MON key the NAV and ALERT on the top line are highlighted alternately Highlight NAV and the screen should look like the one illustrated below 08 24 30 09 15 535 LAT 37 Lon 1227 ROUTE D ALERT 49 010 N 21 525 W 10 090 D 100 2 98 2H 36 58 22 ax 2 65R 7 1 1 KT 1 3 8 0 FT 23 4 c SPD DEP Ship s position LAT LONG reading with 0 001 resolution Route ID FROM WPT TO WPT gt NAV data explained on page 37 amp 38 Water depth Water temperature You may enter an event mark on the ship s present position by hitting EVT 40 Exiting the Plotter aided Navigation When a trip is over you may deselect FROM and TO WAYPOINTS Press TO 0 0 and ENT in that order and wait until the plotter screen appears automatically You should see the FROM TO WAYPOINTS the INTENDED TRACK LINE and the related indications erased from the screen 41 AYPOINT ROUTING NAVIGATION In the preceding chapter you learned how to sail to a destination but it does not involve course changes In many cases a trip to a destination requires several course cha
57. f the connectors 2 Drill four pilot holes for the bracket 3 Install the bracket by using the screws supplied 4 Fit knobs rubber washer and knob washers to the display unit 5 Install the display unit in the bracket Tighten the knobs securely Fix the bracket in the Fit knobs and washers Instal display unit planned position to display unit onto the bracket S perm 7690 y NS washer Rubber washer Rubber washer Knob washer Mounting the ANTENNA UNIT When you install a TV antenna you would normally select a place which provides the antenna with an unobstructed line of sight to broadcasting stations usually a rooftop However even if there is an obstruction between the antenna and a broadcasting station reception is possible to considerable extent since the radiowave used for TV can curve With the GPS antenna however you cannot expect reception without a clear line of sight between the antenna and the GPS satellites This is because the radiowave used in the GPS system is a microwave which propagates straightly Install the GPS antenna as high as possible free from the influence of nearby funnels masts stacks riggings antennas etc If an object exists within line of sight to a GPS satellite reception of a satellite with low elevation angle will be obstructed resulting in long lasting or INT condition The frequency of GPS is 1575 42 MHz which is far higher
58. gainst other sources such as radar visual and celestial sightings sounding measurements etc to verify the reliability of the data HANDLING PRECAUTIONS FOR THE DISPLAY UNIT 1 The display unit is carefully constructed to be able to withstand the humidity and corrosive atmosphere common in a pilothouse but it is not designed to be used outside directly exposed to the environment Salt water spray or even coffee spills will most assuredly cause damage to the sensitive components inside Keep these factors in mind when planning the installation of the display unit Many owners will undoubtedly use the GP 1250 on small boats many with center consoles The Display Unit must be mounted inside an enclosed cabinet completely shielded from salt water spray and from fresh water spray if the boat is usually hosed down after a day s outing Corrosion can occur especially on the rear connectors exposed to salt spray unless these are taped and thoroughly sealed with putty compounds made especially for this purpose Most small center console boats are equipped with such an enclosed cabinet behind the wheel and most have clear doors so that equipment may be seen behind them FURUNO WILL ASSUME NO RESPONSIBILITY FOR CORROSION DAMAGE CAUSED BY EXPOSURE TO EITHER FRESH OR SALT WATER SPRAY 2 Accumulated dust on the exterior surfaces including the CRT may be removed with a soft cloth For stubborn dirt use a soft cloth and a mild soap Never u
59. h checkout cannot be overemphasized ORGANIZATION OF THIS MANUAL Layout of this namual is so designed to guide the user along in the use of the gear as gently andas comfortably as possible in a series of chapters that start at a very basic level and proceed forward in complexity in a logical manner Contents of this manual are briefed below About GPS This chapter explains principle of the GPS system and the operation of the GP 1250 Some important concepts such as HDOP BACK UP NAVAID ALMANAC etc are also explained in this chapter These knowledges are indispensable to understand the succeeding chapters BASIC LEVEL OPERATION This chapter explains the most elementary but most important operations mainly concerning the plotter screen When you are through with this chapter you may perform position fixing plotting and may be able to sail to a desired location using a cross cursor About MENU SCREEN In the succeding chapters you enter various data through menu screens This chapter allows you to get familiar with the menu system WAYPOINT NAVIGATION You may sail to a desired location in the shortest path using a sophisticated method called a Waypoint Navigation ROUTING NAVIGATION Unlike the waypoint navigation this method supports a navigation involving a series of course changes The following chapters cover the operations which are more advanced or more seldomly used when compared with the ones explained until now
60. he dry battery which was connected in step 4 for temporary back up 9 Fix the newly connected lithium battery with the fixing metal 10 Turn the machine on and confirm that the memory contents are not lost See page M 10 APPENDIX Replacing ROM CHIPS CAUTION Even if the machine is turned off some circuits are kept alive by the back up battery Do nottouch the circuits unless instructed below Shortcir cuit may result in defect of the component or loss of the memory contents 1 Put the machine on the table upside down 2 Loosen the four screws and remove the cabinet cover L x4 GDC 22 0028 3 Extract the ROM chips U6 and U7 from the GDC 22P0028 board by using an IC extractor 4 After inserting the new ROM s into the sockets fix them with a plastic tie Program Nos U6 225 0112 1xx U7 225 0112 2xx Version No 5 Turn the machine on and confirm that the memory contents are not lost See page M 10 AP 16 Maintenance Parts List for GP 1250 kk k k KK 004 029 010 000 111 844 100 082 333 Antenna Unit Printed Circuit Board Printed Circuit Board Printed Circuit Board Keyboard Module Power Supply Module CRT Module CRT Filter GPA 014 22P0030A AMP NAV 22P0031 SIG 22P0028A GDC 2280238 KEY 2250160 PWB MG750 SFR 22 001 0122 3 Export Version Export Version Incl Panel amp Keyboard amp
61. ienced navigators know high accuracy can be expected when the targets are spaced nearly 90 degrees approx from each other Similarly GPS fix accuracy is subject to the locations of 3 satellites in the sky Roughly speaking high accuracy is obtainable when the satellites are widely scattered in the sky on the contrary accuracy is reduced when the satellites have gathered in a narrow space angle See the figures below In both cases GPS fix is obtainable in Tokyo since 3 satellites are in line of sight However accuracy in the right case will be higher than the left because 3 satellites are located in three different apart locations As the index for position fixing accuracy HDOP Horizontal Dilution of Precision is widely used The smaller the HDOP value the more accurately position can be fixed For instance HDOP of 3 to 5 are considered desirable but values above 20 represent poor GPS fix accuracy While each satellite is revolving in a different direction the geometrical distribu tion of 3 satellites e g HDOP value changes as time elapses Error in distance is proportional to the HDOP value as shown below ERROR RMS 60m 45m 4 30m 4 15m4 T T T T gt HDOP NOTE 1 The error shown above occurs in the GP 1250 under favorable receiving condition 2 GPS system accuracy is under control of the US Government the error above is subject to change You may register a HDOP Threshold value in the GP
62. ing capability 20mA is greater than the total load 16mA 4V 500 ohm 2 units 2 If the OUTPUT port is occupied by an auto pilot NMEA 0180 no other device NMEA 0183 may be additionally connected to this port even though the driving capability is large enough 3 OP22 1 Connection Kit optional is required This kit includes the plug for GP 1250 end only Use the cable included in the options for the autopilot or color sounder 4 Do not forget to strap a jumper between pin 13 and 14 on GP 1250 5 Ground unused twisted pairs Floating wire causes noise 5 2 218123713 STON 20445 E 104 16 v0 oe ee MEN EC 4 93 Y 0349385 2 AlddnS 8304 Nx om 240 oH 22 1200422 24 130 409 5 28 e00S22 492 24 575502 MAIEN EII 000422 Reed 20d ERR 24 4 2 LGW Apt 1 0132 0 9D 15 8 00 LEE92 OMG mj MJ 223 VIN OH IA NAYHO 9 en omg WYXOVIC 01123 02831 1 WwW aoe H3ddO HLIM GNNOYD 18405 1vNOILdO 03810838 Si 318 2 0 0 1 2240 LIN 80123 03 TWNOLLdO S1 1378 0 2 2240 LI H0133NNOD HO 1
63. k up navaid are stored in When you press the EVT key an event position is stored in as well The contents of partition D are always visible on the plotter screen as ship s track line or event marks KKK KRY Internal GPS or Fixed External Navaid Re 99 Hit of EVT key Event Mark Event Mark tM Waypoints 99 points max 4 Partition is presented on CRT as Plotter Screen A 53 Saving ship s track line You may copy partition onto 2 3 for future reference All memories are kept alive even when the power is shut down MEMO 1 eterna STORE TRACK amp MRKS INTO PART X Status of each partition PARTITION NQ 1 appears NER UPDATED is displayed for partition No 1 since present position is being entered there If USED is displayed it means that the partition was written before If you overwrite it the existing contents will be lost 4 UNUSED means that the partition is empty These numbers show how many position data each partition contains MARKS event marks Y ENT Enter a partition number on which you want to copy to 1 ENT The plotter screen appears automatically 54 Overlay You may overlay partition D with 5 3 This feature is useful when you want to follo
64. ld not be plotted theoretically However you will see it done randomly within a narrow area on the screen This is because of position fixing error and can not be prevented If you want to disable plotting function use the following keystrokes Display the plotter screen Y SHFT SHFT Press the key twice and you will see the plotting interval highlighted 3MIN By tapping this key call up HALT Y CLR The highlighted rectangle disappears To restart plotting call up the previously used plotting interval rather than HALT Two plotting intervals are available For further information see pages 69 and M 19 Erasing a track line When the plotter screen is filled with track lines you may clear them by pressing MEMO 3 and ENT in that order Erasing event marks See the preceding page 22 BASIC 96 d GJ pawaq 1 13u A IZEI 10114 2813 88019 uonoeuiq 8 1 15 pasinbaa o1n12oduig xF 19M pouinboa 10100 xg ydq WM d OL 01 03 0j ouirp 10 03 0 9208 uonisod juasaid Sunesg Ld AA OL Jo 8 5 46 poods Sumpvo1ddy LAM OL 01 10 peads s dius Su UonIsog 3098914 99d 6t d Jopiog Suojyie1 1 1 UOIJ22110 281 8010 JLX BeW AOVIN
65. lected properly Don t worry if the TO WAYPOINT is not displayed This is because the waypoint is out of the scope of your screen 08 20 90 2 16NM UU 1 85 09 30 505 MAGV FROM WAYPOINT e a D ie Distance To Go from the present position i k to the TO WAYPOINT 4 ae TO WAYPOINT Intended Track Line i Me 195 29 71 Cross rack Error XTE On a voyage between a FROM WPT and a TO WPT a straight line drawn between the two points is known as a TRACK It could just as well be termed the INTENDED TRACK because although it is the use s intention to follow this course faithfully in reality he never can do so perfectly due to wind current etc The amount which the boat is thrown off the intended track is termed the CROSS TRACK ERROR and appears on the screen along with the wheel steering instruction Ex 1 TO a lt lt lt 7 Steering instruction Steer left 1 23R t Ship is deviated to FROM wer R ight by 1 23 NM Ex 2 To gt gt Steering instruction Steer right XTE irack e CO ho T l t i t 0 Ship is deviated to L eft by 0 32 NM 0 32NM FROM WPT As explained on page 51 you may set a safety lane on both sides of the intended track The GP 1250 increases the number of the arrows in proportion to the cross track error amount One mark
66. lker ID 2 To use the external navaid for back up enable the back up function See page M 27 3 To use the GP 1250 as a plotter for the external navaid without using the built in GPS receiver see page 70 M 29 The primary purpose of this port is to supply various nav data to a color sounder autopilot etc Though it is labeled OUTPUT it can receive water depth and temperature data to display them on the plotter screen If any device is connected to the OUTPUT port declare its specification MENU 7 3 een PORT 2 NOW PLEASE Selecting a INPUT format 1 1 ENT to select the FURUNO CIF format or 2 ENT to select the NMEA 0183 format PORT 2 NOW PLEASE 2 OUTPUT INPUT OUTPUT SETTING INPUT FURUNO CIF FURUNO CIF SELECT EACH OF BELOW CHOOSE INPUT FORMAT 1 INPUT FURUNO CIF 2 INPUT NMEA 4183 CHOOSE B SETTING NMEA 0183 FURUNO CIF SELECT EACH OF BELOW CHOOSE OUTPUT FORMAT 1 OUTPUT FURUNO CIF A 018 2 QUTPUT NME 183 3 OUTPUT NMEA 8180 CHOOSE Selecting a OUTPUT format 1 1 ENT to select the FURUNO CIF format 2 ENT to select the NMEA 0183 format or 3 ENT to select the NMEA 0180 format for Autopilot only 3 PLOT NOTE 1 During the GPS position fixing period the GP 1250 transmits data with the talker name GPS During the back up period the G
67. ly from other antennas particularly from a microwave antenna such as INMARSAT Two mounting methods are available For the outline drawing see page D 2 CAUTION Do not use the antenna for GP 300 or GP 500 They are not equivalent to GP 1250 s antenna electrically A different supply voltage is used APPENDIX CABLING Cable connections to the GP 1250 s display unit are made at the connectors located at the rear of the unit The following illustration shows where to make the connections ava AUTOPILOT or COLOR SOUNDER EXTERNAL NAVIGATOR Ship s bonding syston metallic tanks engine block through hull metal fittings etc Before connecting to external devices read Adjusting COMMUNICATION PORTS on page M 27 12124132 BATTERY 111040 Vdc 22W 14 W in the ECONOMY mode Ship s power lines are notorious for being dirty electrically The voltage can go all over the place as various heavy loads are placed on the line and the power wiring is a prime source for interfering electrical signals from such sources as alternators or generators and other electronics equipment like radars or echosounders The GP 1250 is very forgiving machine since it has a built in universal D C power supply that can take input voltages from 11 to 40 Vdc However a piece of gear of this quality deserves to have a circ
68. ly in line of sight Al manac reception begins soon If a high num ber satellite is in line of sight you will have to wait a ling time a few tens minutes in the worst case Unless a satellite is currently available you have to wait more Y When the Almanac has been received the ALMANAC DATE TIME appears on bottom portion of the ALERT screen NOTE After the ALL MEMORY CLEAR operation Almanac is erased already If you wish you may directly proceed to the SATELLITE No entry by pressing MENU 8 and CLR in this order Replacing the LITHIUM BATTERY in a RAM CARD The RAM card used for the GP 1250 contains a lithium battery which preserves the memory contents for about 4 years To ensure important information will not be lost record on the card label the date the card was purchased Replace the battery well before the expiration date Use BR2325 3V lithium battery only It will be available at a camera shop electric appliance shop supermarket etc Lithium Battery BR2325 3V Procedure 1 Turn your GP 1250 on and insert the RAM card into the card slit 2 Press MENU 9 and 3 in this order and the GP 1250 supplies power to the RAM card You should replace the battery under this condition because even a momentary power suspension can result in volatilization of the RAM card contents Do not remove the RAM card from the GP 1250 until you replace the battery 3 Unfasten the small screw illustrated i
69. mation will not be lost record on the card label the date of purchase and change the battery well before the expiration date Instructions for replace ment of the battery are given on page M 8 HOW TO ATTACH THE VIEWING HOOD A viewing hood comes with this unit and may be attached to the CRT to eliminate extraneous light 1 2 oM Insert the other edge as well Insert the hood edge into the unit A magnifying lens is factory attached to the viewing hood If you do not require its function you may remove it 1 If the hood is attached detach it from the display unit 2 With the hood body pulled outward disengage the lens How GPS works Position fixing Accuracy HDOP and BACK UP NAVAID GPS Satellite Arrival Time amp ALMANAC GPS PLOTTER Tutorial 6 Getting Started PWR OFF DIM PLOT 6 Interpreting On screen Indicators 10 Magnigying Character Size 11 CURSOR SCREEN Manipulations 5 Arrow Keys CTR 13 Concurrent Dual Page Plotting 15 Sailing to a cursor pointed location 16 Entering EVENT MARKS 18 Selecting a mark shape SHFT lt gt Entering an event mark EVT Erasing event marks MENU 4 After sailing Operations Suspending track line plotting Erasing a track line Erasing event 2000 00 More
70. n the left figure then carefully take out the battery holder as illustrated in the right hand figure ide AS wo BATTERY HOLDER Hold the RAM Use screwdriver for precision To pull out the battery machine which will be available holder hook your nail at tool shops D I Y shops large in the ditch supermarkets etc M 8 MAINTENANCE 4 Place a new battery in the holder then store the holder in the RAM card Fasten the small screw DOWN UP c N Hold the battery with positive your forefinger side is down 5 Press PLOT Now you may take out the RAM card from the GP 1250 M 9 MEMORIES SOME ERROR In the power on self test the GP 1250 checks if its memory contents are intact If any memory contents are found destroyed it displays SOME ERROR on the STARTUP STATUS screen prompting you for an instruction STARTUP STATUS RAM SYSTEM AREA OK RAM USER AREA MEMORIES SOME ERROR PLEASE CHOOSE EITHER ONE BELOW 1 KEY SAVE WAYPOINTS 2 KEY ALL MEMORIES CLEAR You have two choices e if you don t mind clearing all the memories including waypoints press 2 e If you didn t record waypoint data a log and want to exclude waypoints from ing f A 1 Press 1 to exit the STARTUP STATUS screen 2 Display the waypoints and record their latitude longitude in a log so that you can reenter
71. nd this information is received the GP 1250 includes it in the schedule Accordingly it is usually not required to deselect a satellite manually Sometimes abnormal satellite number is not broadcasted by any satellite If you learn of an unhealthy satellite through official announcement etc deselect it manually When the satellite has restarted normal operation do not forget to reselect it because the manually deselected satellite can not be restored automatically Abnormal satellites presented on the ALERT screen MON page 8 are automatically deselected ones the disabled satellites presented on the following screen are manually deselected ones DISABLE SATELLITE List of DISABLED NOW NONE satellites NUMBER TO DISABLE MENU 6 6 se NUMBER TO RESTORE DISABLE RESTORE SAT NO W Y 1E 1HENT Enter the satellite number of which the reception you want to disable and you will see the number added to the list of disabled satellites displayed in the upper portion If you want to enable it again enter the satellite number You will see the number deleted from the list Y PLOT M M M a M M Running the SELF TEST Program If you feel anything wrong with your GP 1250 run the self test program as follows MENU 9 1 ENT In a few seconds the GP 1250 will report the test results on the SELF TEST screen SELF TEST X
72. nges calling at harbors avoiding islands etc Your GP 1250 supports this type of navigation You will practice the following operations in this chapter 1 Entering the course changing points and the final destination as waypoints We call sequence of waypoints leading to the final destination a ROUTE 2 Registering a route by entering a route ID number and a series of waypoint numbers leading to the final destination You may enter up to ten routes in your GP 1250 3 Selecting a route between the ten 4 Plotter aided navigation Entering a ROUTE First enter course changing points and the final destination as waypoints See the Entering WAYPOINT section on page 29 Next enter a route as follows WPT 2 ENTER ROUTE You can see a list of route ROUTE numbers which had been entered in your GP 1250 Ox PLEASE SPECIFY ROUTE NO 81 10 ROUTE NO BL 42 ENTER ROUTE X ROUTE Ni 9 29 5 7 NOR Oe NODE UNDO OOO 1 2 3 4 5 6 7 8 9 e NTER 10 WPTS FOR A ROUTE ENTJ A WPT SHFTI CENT REMOVE A WPT WPT 1 NEW ROUTE M On the right half portion of the screen waypoint list is displayed Press the lt gt key to display the rest of the list Y 1E 4 Enter waypoint numbers serially from the first course Lj changing point to the destination and you will see th
73. o equipment however shorten the cable In this case cut the cable at the display end and solder the BNC connector supplied to it as follows UNIT mm 1 Remove the PVC sheath by 13 5 mm k ue ll Protector 2 c Separate the shielding mesh into two gt pieces as shown left 3 bs 4 Remove the insulator by 5 mm d 4 ps NN _ Shape the two pieces of the mesh flat T and trim them as shown left 5 You would see two soldering holes arranged on the inner shell Insert the cable end into the inner shell while leading the two pieces of the mesh into the soldering holes through the slits The 5 mm tip of the core lead should be inserted into the pin of the shell Soldering Pushin 6 Screw the outer shell onto the inner shell which are soldered to the cable end Couple the fixing nut to the outer shell Outer Inner Fixing Shell Shell Nut Using the 30 50 M CABLES optional the lists on pages AP 19 and AP 20 The 50m or 30m cable 8D FBCV can not be connected to the GP 1250 directly because the diameter is too large for the GP 1250 end connector Shorten the cable to a suitable length Solder the N P 8DFB plug included in the 30 50 M CABLE SET to the cable end as instructed on the next page Joint it to the 1 m connector conversion cable which also comes with the 50m or 30m cable ANTENNA BNC 0 25 BNC N 30 50m CABLE im Dno FOTO 0 pispLaY BNC N NN BNC
74. ocal time If not you may omit this operation ANTENNA HEIGHT Page M 25 Measure the antenna height above the sea level and enter it This parameter affects the GPS position fixing accuracy This operation is a must if external devices such as a back up navaid color sounder or autopilot are connected vam Page M 27 14 Entering estimated LATITUDE LONGITUDE If the latitude longitude of the present position is different from the actual position by more than 10 degrees GPS position fixing may not be initiated Enter estimated lat long as follows MENU 1 gt INITIAL LAT amp LON SETTING X TANGEARLE DURING NOT CHANGE LENT KEY LAT Y 1 Enter estimated LATITUDE within 10 degree accuracy LON Y LIETIE P ENT Enter estimated LONGITUDE within 10 degree accuracy PLOT NOTE 1 During the GPS position fixing operation the GP 1250 does not accept your latitude longitude entry displaying POSITION FIXING 2 The latitude longitude settings are automatically replaced by a GPS fix when the HDOP is better than 99 If not they are updated by the back up navaid if connected When the HDOP is inferior to the HDOP threshold the GP 1250 displays the position data from the back up navaid However GPS position fixing is performed internally until the HDOP becomes w
75. om the built in GPS or back up navaid If you want a GPS fix with 0 001 minute resolution see page 40 IGN The GP 1250 displays the following STATUS signs Ship s SPEED and COURSE moving direction are read here If i 1 1 i 1 1 1 1 1 D 1 1 1 1 1 your boat is moored in a harbor the COURSE reading may fluc tuate randomly This is because the ship s speed is zero and conse quently the speed measurement is 10096 random noise The reading should stabilize as the boat speeds up 10 BASIC This feature is useful when your GP 1250 is installed away from the helm and difficult to read the digital data on the screen You may magnify the following indications 34 23 15N i 1 135 23 15 i S 12 5 32 57 L 224 3 i Keystrokes Press 1 i saa i i Press the SHFT key and you will see a highlighted rectangle Wal fa er i presented on the top center of the screen Further pressings of SHFT will move the highlighted rectangle from indication ajj e to indication evr ni i By pressing SHFT move the 2 highlighted rectangle onto the E item which you want to magnify 18 8 for instance the latitude and ig a i i 25 42 21 i ig longitude
76. orse than 99 Entering DATE TIME LOCAL ZONE TIME This operation is required when the PRESENT DATE TIME readings are advanced or delayed more than one hour The GP 1250 may not receive a satellite if the internal clock is off more than one hour from the actual time This operation is also required if you want to display your local time on the on screen clock MENU 2 X DATE TIME amp LOCAL ZONE TIME X ZONE 00 00 HOUR MIN gt v YEAR UTE SECOND gt TIME amp DATE NOT CHANGEABLE DURING SAT RECEPTION LOCAL ZONE TIME M __ Y JU hr min gt ENT Enter LOCAL ZONE TIME consulting the chart on page M 18 Select Regardless of the PRESENT POSITION you may enter local zone time you want The GP 1250is smart enough to adjust the on screen clock to show a present time which is local to the designated zone Depending on the local zone time one of the following suffixes is attached to the on screen clock reading GMT Greenwich Mean Time J JST Japan Standard Time S L others Y mon day year ENT Enter today s DATE which is local to the above entered zone For the year enter the lowest 2 digits EX 19 9 6 for 1996 20 0 0 for 2000 Y J hr min sec ENT Enter present TIME which is local to the above entered zone Y PARAMETER PLOT NOTE 1
77. overlay Capacity of RAM Card Each RAM card can store the following quantities of data 56 99 points of waypoints 1800 points of track line plotting 1524 points of event marks Don t misconstrue that the entire capacity is divided into the three fixed areas for waypoints track line and event marks respectively No the memory structure is flexible If less event marks are entered for example you may enter waypoints the more Formatting a RAM card Before using a brand new RAM card you must add a process called formatting to it NOTE 1 An unformatted RAM card can t be read or written by the GP 1250 2 Formatting is required one time only If a RAM card containing any data is formatted the data is 1051 Insert a brand new RAM card into the card slit MC 8 rere INITIALIZE MEDIA X ENT PLOT ANOTHER RAM CARD PLS HIT CENTI KEY lt NO CARD OR DEVICE ERROR gt 57 Saving reloading SHIP S TRACK LINE EVENT MARKS Insert a RAM card into the card slit MC 2 P Qu STORE DATA INTO MEDIA X PARTITION NO 1 UPDATED O UNUSED A partition list appears P PP 9 3 USER CHOOSE PARTITION NO B Y ENT Enter the partition number which you want to save A track line file list appears These track line files already STORE DATA INTO MEDIA exist in the RAM card FILE NAME DATE SIZE am
78. p MEMO 61 T 0001 03 27 90 10 45 15 To display the rest of the list 91 T i9B9 03 27 90 10 45 13 A T1990 03 27 90 10 45 15 press 7 LgJ KEY CHANGES PAGE SE PARTITION NO 3 NAME ON MEDIA TN y 1E 1E 1f ENT Enter a 4 digit label ID number for a new file The GP 1250 automatically adds prefix T meaning Track line to the 4 digit number Y PLOT 58 Insert a RAM card into the card slit Y MC 4 RECALL DATA FROM MEDIA H 7 FILE NAME DATE SIZE amp MEMO A track line file list appears T8001 03 27 90 10 45 15 T 1989 03 27 90 19 45 13 To display the rest press 83 1 1998 83 27 90 10 45 15 C i t CBI KEY CHANGES PAGE i CHOOSE FILE NO amp 2 1 7 T1IENT Enter the 2 digit number assigned to the intended file label RECALL DATA FROM MEDIA x PARTITION NO 1 UPDATED NO 2 UNUSED NO 3 USED CHOOSE FILE NO 2 7 1989 CHOOSE PARTITION NO B Y 1E 1 Enter the partition number on which you want to reload the file to If the number of USED partition is entered it is overwritten 1 PLOT 59 Insert a RAM card into the card slit Y AC eene T ERASE WET DATA ON MEDIA FILE NAME DATE SIZE amp MEMO A track line file list appears 01 W 0001 03 27 90 10 56 1614 92 W 1989 93 27 90 10 57 1614 display the rest of the list w 1990 03 27 9
79. phenomenon is notable when the ship s speed is high For no smoothing enter o Usually use 0 increase the setting if the GPS fix fluctuates intolerably t PLOT Y ENT Enter an index 0 to 9 for SPEED COURSE smoothing During GPS position fixing ship s velocity Speed Course is directly measured by receiving GPS satellites The raw velocity data usually varies randomly depend ing on receiving condition etc This random variation may be reduced by smooth ing averaging the raw data as illustrated below Speed Course x x x X x x X raw data 77 atter smoothing xxxx raw data after smoothing Timc The higher the setting the more smoothed are the raw data If the setting is too high the response of the speed course readings becomes slow For no smoothing enter 0 Setting 5 is commonly used Speed Course 7 Actual Presented Actual o Presented Time Time NOTE The course reading becomes unstable as ship s speed slows down This is reasonable and can not be prevented The setting should be ad justed when the boat is running at the normal speed PARAMETER ANTENNA HEIGHT MENU 6 4 eee 5 NOV RANGE 999M 9999M ANTENNA HEIGHT BN M Y E 1E 1E m ENT Enter the antenna height above the sea level Measure the antenna height as accurately
80. rent loop to the voltage level which swings between positive and negative voltages Modification 1 Place the display unit on a tabletop upside down 2 Remove the cabinet cover after loosening the four screws x4pcs 095 257 Bs amp DC 22 0028 3 Find mark U25 which is located by the jumper plug post S2 on the GDC 22P0028 board Solder there the RS232C interface IC LT1080 manufactured by LINEAR TECHNOLOGY optionally available from Furuno as 0P22 3 We recommend you to solder it from the component side of the pcb because the chassis panels must be disassembled to considerable extent to gain access to the soldering side Soldering work should be carried out with the utmost care not to damage neighboring components It is recommended to remove the jumper plugs from post S2 temporarily and use a good soldering iron of 20 W or so and high grade soldering lead It is also important to clean the pins of the IC beforehand 4 Set the jumper plugs on post S2 on the GDC board 22P0028 and carry out wiring as instructed below 1 EXT NAV OUTPUT ports RS232C 2 3 4 5 6 Si 2 plug ON ON ON off ON off plug ON GP 1250 Ext machine EXT NAV RS232C RXD4 TXD DTD 6 DSR GND 10 GND EPST 7 GND8 OUTPUT RS232C TXD 2 RXD DSR8 DTR GND10 DTR OPST 13
81. s behind the display unit Also allow at least a foot or so of service loop in the cables to allow the unit to be pulled forward for servicing or internal adjustment APPENDIX DISPLAY UNIT lt 280 11 07 lt 231 9 17 gt Uos 178 7 07 247 9 77 lt 315 12 47 5 235 9 37 5 The display unit can be mounted on either a tabletop bulkhead or overhead Make sure that the selected location is strong enough to support the unit under the conditions of continued vibration or shock which will be normally encountered on the boat If necessary appropriate reinforcement measures should be taken in the mounting area 6 The display unit should be mounted apart from equipment s emitting heat Also do not put thing s on the top of the unit The outline drawing is available on page D 1 at the end part of this manual Mount the display unit as instructed below using the mounting materials ACCESSORIES listed on page AP 21 1 Mark the screw locations by using the bracket as a template As was stated before make sure you allow enough clearance both to get to the connectors behind the unit and to allow you to get your hands in on both sides to loosen or tighten the mounting knobs Make sure you leave at least a foot or so of service loop of cables behind the unit so that it can be pulled forward for servicing or easy removal o
82. s section you will select one waypoint as a destination We call the starting point and the destination waypoint the FROM WAYPOINT and TO WAYPOINT respectively Keystrokes SELECT NAVIGATION NAV OFF waypoint list appears view the rest of the list press the gt key PRESENT POSIT NO 4 FROM gt TO ROUTE Y 1E J ENT Enter a WAYPOINT NUMBER TO WPT and a second later the plotter screen appears automatically Note that the ship s position at this moment is entered in WPT No 00 and the WPT No 00 is selected as a FROM WAYPOINT implicitly If you wish you may specify a FROM WAYPOINT explicitly TO TO Press the key SELECT NAVIGATION X OFF Enter a FROM WAYPOINT number 5 M IWPT8OO PRESENT POSIT L 3 CHANGE PAGE FROM WPT TO wPT 10 Enter a TO P eaa aao gt DAT KE WAYPOINT number CON i LON X ek ox FROM WPT NO FROM gt ROUTE WPT G gt TO 2 34 A second later the plotter screen appears automatically You will see a cross track error displayed at the lower right corner if the ship s position is off the intended track line 35 Plotter aided Navigation When the FROM and TO WAYPOINTS are selected the plotter screen appears automat ically Confirm that FROM and TO WAYPOINTS are se
83. s the up arrow key again You will see the highlighted rectangle erased and the following message appears on the bottom line IF HIT RETURN TO UPPER MENU gt This means that the current screen is a sub menu of another main menu screen and that another press of the up arrow key will recall the main menu screen This feature reduces keystrokes when you want to go back to the previously displayed text screen 28 WAYPOINT NAVIGATION In navigational terminology a particular location is know as a WAYPOINT whether it be a harbor fishing ground etc You may enter in the GP 1250 up to 99 locations as waypoints Later you may select one waypoint as a destination and your GP 1250 calculates the shortest path and tells you how you should steer the helm to follow the path Entering WAYPOINTS Enter your future destinations as many as you like In this section you will learn to enter waypoints in the following three methods 1 by LATITUDE and LONGITUDE This method is useful to enter locations harbor etc of which the latitude and longitude you read from the sea chart Also this method is usable when you enter a good fishing ground of which the latitude and longitude came from your partner boat 2 at PRESENT POSITION When a wreckage which is usually a good fishing point is recorded on your echo sounder you would like to enter the present position as a waypoint You may do it easily by this method Also you ma
84. se chemical solvents such as alcohol benzine etc They may remove paint and markings 3 Before operating the unit confirm that the copper ground strap supplied is properly connected between the GND terminal on the rear panel and the ship s ground bus 4 The anti radiation filter attached to the CRT aperture prevents interference to radio equipment For that reason do not detach it 5 Ona small boat it is rather common that the supply voltage fluctuates largely when turning the engine on If the GP 1250 is then in the operating condition it may accidentally mulfunction resulting in destruction of memory contents To avoid this start the engine with the GP 1250 turned off HANDLING PRECAUTIONS FOR THE OPTIONAL MEMORY CARDS 1 The digitized coast lines contained in the ROM card are designated to supplement navigation charts not replace them The prudent navigator always checks his position against paper charts 2 To prevent destruction of the RAM card contents turn on or off the unit with the card pulled out from the card slit 3 Keep the card out of direct sunlight Do not place it in hot wet or dusty environment Keep it away from electrified material Do not put it in a plastic bag the pocket of a nylon jacket etc Keep the card edge connector clean Do not strike bend nor disassemble the card 4 A lithium battery in the RAM card preserves the memory contents for about 4 years ensure important infor
85. shorter when compared with other ship s GPS 1 Isn t the HDOP THRESHOLD page M 25 set too low 2 Aren t healthy satellites DISABLED page M 1 by mistake 3 Isn t there a mast funnel etc near the GPS antenna MAINTENANCE Isn t the GPS antenna close the INMARSAT antenna During the 2 D period transmit the INMARSAT Doesn t the sign change to INT If it does GPS reception is interfered PARAMETER SETTING After the unit is installed various parameters must be entered You may adjust their settings in daily operations to meet various requirements in the field NOTE 1 Although the memories are preserved internally even when the power is failed it is highly recommended to keep record of parameter setting just in case It is a good practice to fill in the brackets in this chapter 2 The default settings are available on page M 5 There are many parameters to set but the following ones are particularly important Unless you set them properly your GP 1250 will not work at full performance or may not receive a satellite at all Estimated LAT LONG enn Page M 15 Enter them if the PRESENT POSITION reading is different from the actual position by more than 10 degrees If not you may omit this operation DATE TIME LOCAL ZONE TIME gt Page M 16 Enter them if the PRESENT DATE TIME reading are off by more than one hour from the actual time or if you want to display your l
86. sition observed from the present position Cross Cursor Changing the Chart Scale In order to expand or shrink the chart scale hold down the lt or key You should see the chart scale reading count up or down while the key is held down and the chart is repainted with the new scale when the key is released CHART SCALE Horizontal Span n mile across the CRT screen 08 2180 21GNM A 1 MIN 6PS 09 30505 t 34 23 15N T 03523 15 Hold down the arrow keys with and without the cross cursor presented on the screen If the cursor is presented the arrow keys move it If not they scroll the chart The following table summarizes the above mentioned functions 13 Functions Cursor displayed Cursor erased While the key is held down the chart When the key is released the picture The cursor pointed position latitude and longitude is centered scale reading counts up or down is repainted with the new scaling The own ship position is centered Controls the cursor Scrolls the screen When the screen is scrolled up to its border the GP 1250 peeps If you want further scrolling release the key once then hold it down again Repaints the screen with the cursor pointed latitude and longitude at the screen center 14 Repaints the screen with the own ship position at the screen center BASIC The GP 1250 plots two pic
87. them later See page 33 3 Execute the ALL MEMORY CLEAR described on page M 4 then reenter the waypoints ul After the above operation regardless of whether you selected 2 or 1 in the STARTUP 9 STATUS screen the following operations are required 5 ui PARAMETER SETTING Page M 14 E Don t forget to enter estimated latitude and longitude lt COLD 5 6 2 If MEMORIES SOME ERROR appears the next time the power is turned on the internal lithium battery good for 3 years is used up Call for replacement INT GPS or INT GPS BACKUP DATA ERROR In the power on self test the GP 1250 examines the function of the built in GPS receiver and its memory If any abnormality is detected the following messages appear on the STARTUP STATUS screen The built in GPS receiver is faulty For the time being use your GP 1250 in the Plotter only Mode page 70 if an external navaid is connected INT GPS BACKUP DATA ERROR The memories of the built in GPS receiver were not intact The GP 1250 already cleared the memories including the Almanac and C ST Cold Start condition has been invoked Wait until the Almanac date time appear on the ALERT screen If you know what satellite is now available in line of sight perform the COLD START operation described on page M 6 If the same message appears at the next
88. tline image Y To TURN THEPOWER ON press the PWR key The unit acknowledges it by releasing a long peep and the power on self test sequence runs automatically Ba In a few seconds you will see the STARTUP STATUS screen as illustrated below START UP STATUS SCREEN STARTUP STATUS RAM SYSTEM AREA OK RAM USER AREA OK MEMORIES NOW STARTING UP lt WARNING gt THE CHARTS CONTAINED ON THIS CARD ARE FOR REFERENCE ONLY AND ARE NOT INTENDED FOR NAVIGATION NOTE df a card is not inserted or if the inserted card does not contain a coastline of your current area the warning CHART ap pears Flip down the lid and insert the card into the card slit gently with the label side facing upwards Release the card when you feel resistance About one inch of the card should be outside the slit If the GP 1250 finds any error it con tinually displays the STARTUP STATUS screen reporting MEMORIES SOME ERROR MM See page M 10 INT GPS or INT GPS BACKUP DATA ERROR See page M 11 If the test results are OK the STARTUP STATUS screen is followed by the ALERT screen in about 10 seconds Now the screen should look like the one illustrated at the top of the next page GPS POSITION FIXING SCHEDULE FROM UNTIL Mon Day Time gt Time r Threshold gt Page M 25 NAV 4 By 03 2 SELL
89. tures concurrently one is the picture which ch you currently see on the CRT and the other is the one plotted in the background Press several times and you can see the two pictures displayed alternately You may magnify shrink or scroll the two pictures independently Concurrent Plotting lt Swhitched by a toggle key K Itis a good practice to keep a magnified picture in the background so that you may switch to it instantly when close observation is required The purpose of a navaid whether it be a GPS loran C or satnav is to fix own ship s position and to guide you to the destination Until this section you mainly learned the former function In this section you will experience the latter PROCEDURE First display the cross cursor then move it to the latitude longitude coordinate of your destination It should be noted that the cursor moves fast many miles with the chart shrunk Therefore in order to save time move the cursor to your intended point roughly with the chart shrunk then pinpoint it with the chart expanded Latitude and longitude at the cursor crossing appear as illustrated below Latitude and longitude 08 24 90 2 16NM A MIN 1 0 5 t 09 30 505 MAGV at cursor crossing 1 34 22 15N 34 5 25 N 135 23 15E 135723 4 E 5 12 5 Bearing distance to the cursor crossing gt NOTE Cross A true b
90. ue Keep this in mind when you sail to a cursor pointed location See page 16 68 Selecting a PLOTTING INTERVAL As explained on page 53 the GP 1250 can store up to 600 points of latitude longitude coordinates to draw ship s track line The default plotting interval is 5 minutes This means that the memory becomes full after 3000 5 x 600 minutes plotting When the next plotting time has come the GP 1250 erases the earliest end of the track line and adds a new point to the latest end of the track line In other words you can see the past 3000 minutes of track line on the screen The following figure illustrates this operation Present Position 0 600 points Dot interval is 5 minutes L This dot was lost to make Newly plotted dot room for the new dot LL 600 points In your GP 1250 two plotting intervals are available One is called a No 1 INTERVAL 5 MIN and the other No 2 INTERVAL 10 MIN Use the following keystrokes to switch between the two intervals If the No 2 INTERVAL 10 MIN is selected you will see 6000 10 x 600 minutes of track line on the screen PLOT SHFT SHFT Press the key twice and you will see the plotting interval indication highlighted Select No 1 or No 2 INTERVAL The highlighted rectangle disappears Trade off for a longer track line is that ship s track line appears zigzagged when the
91. uit breaker dedicated to it alone The size of the wire feeding power to the unit should be no less than AWG 16 gauge 0 75 mm square How to suppress generator noise Ship s generator dynamo is usually a serious noise source on most boats Here is one method to suppress this type of noise Necessary Parts Electrolytic Capacitor 2200 uF 50 WV Film Capacitor 4 7 uF 400 WV Procedure 1 Solder the two capacitors 2 Insulate metallic parts with and leads as illustrated silicone compound in order below to prevent shortcircuit due to bilge Film Capacitor Silicone Compound Electrolytic Capacitor 3 Connect the above assembly to the generator output Connect it to the output terminal of the generator directly in order to suppress the noise efficiently NOTE Be careful about the polarity of the electrolytic capacitor No less important for proper operation is the ground for the Display Unit On a steel boat a good connection to the hull is sufficient On a wood or fiberglass boat it is best to use a ground plate mounted on the hull exterior if this is not practical the engine block can be used Do not share ground leads that go to other equipment in the console but instead run a separate heavy duty wire for the GP 1250 alone APPENDIX Connect the 15 m antenna cable here If the cable is too long you may leave the slack in cable looped If the GP 1250 gives interference to an adjacent radi
92. unting the DISPLAY UNIT The display unit is carefully constructed to be able to withstand the humidity and corrosive atmosphere common in the marine environment but it is not designed to be used outside directly exposed to that environment Salt water spray will most assuredly cause damage to the sensitive components inside Keep these and the following factors in mind when planning the installation of the display unit CAUTION Furuno will assume no responsibility for the damage caused by exposure to either fresh or salt water 1 The display unit consumes very little power so there is no need of forced air ventilation However it is necessary to provide at least some circulation of cooling air by allowing sufficient space around the unit 2 Many owners will undoubtedly use the GP 1250 on small boats many with center consoles The display unit must be mounted inside an enclosed cabinet completely shielded from salt water spray and from fresh water spray if the boat is usually hosed down after a day s outing Most small center console boats are equipped with such an enclosed cabinet behind the wheel and most have clear doors so that equipment may be seen behind them 3 It is recommended to keep the display unit out of direct sunlight or at least shaded because of heat that can build up inside the cabinet 4 Consideration should be made to provide space for access to the mounting hardware on the side and connector
93. w a past track line etc current overlay MENU 2 pe X RECALL TRACK amp MRKS FROM PART X TRACK MRKS PARTITION NQ 1 UPDATED e NO 2 UNUSED 0 3 0 NO 1 15 ALWAYS DISPLAYED CHOOSE OVERLAID PART NO ma H MENT Enter the partition number which you want to overlay on D plotter screen appears automatically showing the past track line and event marks overlaid on the currently plotted picture eg D When you want to exit the overlay mode press MENU 2 1 ENT in this order 55 RAM CARD optional Before you start using a RAM card read the cautions described at the head part page E in this manual A RAM card allows you to 1 Save all waypoints into a RAM card as a data file and reload the data file on the GP 1250 as waypoints Itis a good practice to keep several waypoint files in a RAM card for each fishing season Or sea area 2 Save a memory partition into a RAM card as a data file and reload the data file onto one of GP 1250 s memory partitions gt RAM card Ifa file is reloaded on D you will immediately see the past track line and event marks on the screen In this case one part of the existing track line and or event marks will be lost ifthe memory capacity of partition 1 is exceeded If it is reloaded 2 or 3 you may see it by
94. y available in line of sight itis helpful for the GP 1250 to acquire the satellite smoothly Therefore itis recommended to find satellite numbers on the Alert Screen page 8 before you start the COLD START operation Note that once that the Almanac is erased a satellite number can not be displayed on the Alert Screen e A satellite acquisition takes several tens minutes even if you enter the satellite number e After the GP 1250 succeeds in acquiring a satellite it receives Almanac which takes about 20 minutes additionally MENU 81 X COLD START MANAC DATE AL 03 26 50 14 34 AETER COLD START ENTER SAT NO FOR ALMANAC RECEPTION COLD START 7 YES CENTI NO CCLRI MAINTENANCE The almanac reception date time are erased Unless you know the satellite number which is available in line of sight i ENT C COLD START ALMAHAC DATE amp TIME eaten ER 5 0 SATELLITE NO COMPLETE gt If you know it Y 1E ENT Enter the SATELLITE No The ALERT screen appears automatically 1 MON Display the ALERT screen Since the Almanac is not available the GP 1250 can not know what satellite is currently available in line of sight So it tries to acquire all the satellites from Sat No 1 sequentially and receives Almanac when the satellite in line of sight is acquired If Sat No 1 is lucki
95. y use this method when your boat is in a harbor and you want to enter its position as a waypoint 3 at CURSOR CROSSING You move the cross cursor to a desired point on the plotter screen and enter the cursor pointed location as a waypoint Each time you enter a waypoint you should record its latitude and longitude in a log This will prevent complete loss of information should something happen to the memories 29 WPT Y Lo Y PLOT ENTER WAYPOINT gt WPT There is room in the waypoint memory to store another 95 points 1 MENT e Enter a WAYPOINT NO 01 99 Y ETEPEIEI EIETP ELS HENT Enter a LATITUDE HENT Entera LONGITUDE lt QUIT CEVT gt WPT NO BL CENTI MARK 5 2 11 gt Enter a WAYPOINT NO 01 99 30 Y 5 9 Display the cross cursor By pressing the arrow keys move the cursor to the latitude longitude coordinate where you want to enter a waypoint Y EVT lt QUIT CEVTI gt WPT NO CENTI MARK ESHFT2zLL Y ENT Enter a WAYPOINT NO 01 99 Waypoint Mark When a waypoint is entered a small cross appears at its latitude and longitude coordinate on the plotter screen NOTE If you wish you may suppress the display MENU 4 1 X DISPLAY WPT MARKS ON OFF X NOW ON 2 ENT PLOT
96. ypoint is permanently deleted from the route PLOT NOTE To restore the excluded waypoint call up the SERIAL NUMBER of the excluded waypoint then enter the waypoint number rather than pressing SHFT ENT 47 MORE ABOUT GP 1250 k k ok ok ok RR ALARM FUNCTIONS The GP 1250 is provided with the following alarm functions and you will learn their usages in this chapter The alarm is triggered when the ship enters into the alarm zone on the TO WPT Own Ship The alarm is triggered when the cross track error exceeds the alarm range Alarm Range FROM WPT 9 Ship 77 TO WPT First register two waypoints a border line then select them as FROM and TO WAYPOINTS The alarm is triggered when the ship enters into the alarm zone on the border line Own Ship Alarm Range FROM WPT 22 7 TO WPT 2222222222 When an alarm condition is breached the GP 1250 peeps and displays a relevant message as illustrated below If you want to silence the peep press the CLR key The visual alarm can t be erased NOTE The GP 1250 releases the alarms in all modes of operation including the ECONOMY mode BDR ARV XTE Alarm Messages ARRIVAL Alarm MENU 5 1 gt ARRIVAL ALARM X LIMIT N M Y 3 eee Enter an alarm range NM J ENT Enter 1 if
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