Garmin DGPS 53 GPS Receiver User Manual
Contents
1. 18 OPCTAllONs cd uo an ina ie 10 18 P Package Contents sss 5 PC Connection ees 8 9 Power Data Cable 5 9 R Registration sse uen ede an a 4 RICM SC 104 format 20 24 S Serial Number sss Sources of Error Sources of Interference Specifications 1e T Table of Contents 3 Troubleshooting cscs 23 VIEUTIRE a server Five pe ertet eov ees 10 13 W Warranty Information Wiring Connections 2000 GARMIN Corporation GARMIN International Inc 1200 East 151st Street Olathe Kansas 66062 U S A GARMIN Europe Ltd Unit 5 The Quadrangle Abbey Park Industrial Estate Romsey SO51 9AQ U K GARMIN Asia Corporation No 68 Jangshu 2nd Rd Shijr Taipei County Taiwan www garmin com Part Number 190 00194 00 Rev A2. 62 ORTH AMERICAN 1927 Cuba 63 NORTH AMERICAN 1927 Greenland Hayes Peninsula 64 ORTH AMERICAN 1927 Mexico 65 ORTH AMERICAN 1927 San Salvador Island 66 ORTH AMERICAN 1983 Alaska Canada Central America CONUS Mexico 67 NAPARIMA BWI Trinidad and Tobago 68 AHRWAN Masirah Island Oman 69 AHRWAN Saudi Arabia 70 AHRWAN United Arab Emirates 26 71 72 73 14 15 76 TT 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 Appendix A Earth Datums OBSERVATORIO 1966 Corvo and Flores Islands Azores OLD EGYPTIAN Egypt OLD HAWAIIAN Mean Value OMAN Oman PICO DE LAS NIEVES Canary Islands PITCAIRN ASTRO 1967 Pitcairn Island PUERTO RICO Puerto Rico Virgin Islands QATAR NATIONAL Qatar QORNOQ South Greenland REUNION Mascarene Island ROME 1940 Sardinia Island RT 90 Sweden PROVISIONAL SOUTH AMERICAN 1956 Bolivia Chile Colombia Ecuador Guyana Peru Venezuela SOUTH AMERICAN 1969 Argentina Bolivia Brazil Chile Colombia Ecuador Guyana Paraguay Peru Venezuela Trinidad and Tobago SOUTH ASIA Singapore PROVISIONAL SOUTH CHILEAN 1963 South Chile SANTO DOS Espirito Santo Island SAO BRAZ Sao Miguel Santa Maria Islands Azores SAPPER HILL 1943 East Falkland Island SCHWARZECK Namibia SOUTHEAST BASE Porto Santo and Madeira Islands SOUTHWEST BASE Faial Graciosa
3. lt l gt lt 2 gt lt 3 gt lt 4 gt lt 5 gt lt 6 gt lt i gt lt 8 gt lt 9 gt 10 ll 12 Using the DGPS 53 UTC time of position fix hhmmss format Latitude ddmm mmmm format leading zeros will be transmitted Latitude hemisphere N or Longitude dddmm mmmm format leading zeros will be transmitted Longitude hemisphere E or W GPS quality indication 0 fix not available 1 Non differential GPS fix available 2 Differential GPS DGPS fix available 6 Estimated mber of satellites in use 00 to 12 leading zeros will be transmitted Horizontal dilution of precision 0 5 to 99 9 Antenna height above below mean sea level 9999 9 to 99999 9 meters Geoidal height 999 9 to 9999 9 meters Differential GPS RTCM SC 104 data age number of seconds since last valid RTCM ransmission null if non DGPS Differential Reference Station ID 0000 to 1023 leading zeros will be transmitted null if non DGPS GPS DOP and Active Satellites GSA GPGSA lt 1 gt lt 2 gt lt 3 gt lt 3 gt lt 3 gt lt 3 gt lt 3 gt lt 3 gt lt 3 gt lt 3 gt lt 3 gt lt 3 gt lt 3 gt lt 3 gt lt 4 gt lt 5 gt lt 6 gt hh lt CR gt lt LF gt lt l gt lt 2 gt lt 3 gt lt 4 gt lt 5 gt lt 6 gt Mode M manual A automatic Fix type 1 not available 2 2D 3 3D PRN number 01 to 32 of satellite used in solution up to 12 transmitted leading zero
4. DGPS 53 integrated GPS DGPS receiver owner s manual and reference guide 2000 GARMIN Corporation GARMIN International Inc 1200 East 151st Street Olathe Kansas 66062 U S A Tel 913 397 8200 or 800 800 1020 Fax 913 397 8282 GARMIN Europe Ltd Unit 5 The Quadrangle Abbey Park Industrial Estate Romsey SO51 9AQ U K Tel 44 1794 519944 Fax 44 1794 519222 GARMIN Asia Corporation No 68 Jangshu 2nd Rd Shijr Taipei County Taiwan Tel 886 02 2642 8999 Fax 886 02 2642 9099 All rights reserved Except as expressly provided herein no part of this manual may be reproduced copied transmitted disseminated downloaded or stored in any storage medium for any purpose without prior written consent of GARMIN Corporation GARMIN Corporation hereby grants permission to download a single copy of this manual onto a hard drive or other electronic storage medium to be viewed for personal use provided that such electronic or printed copy of this manual contains the complete text of this copyright notice and provided further that any unauthorized commercial distribution of this manual is strictly prohibited Information in this manual is subject to change without notice GARMIN Corporation reserves the right to change or improve its products and to make changes in the content without obligation to notify any person or organization of such changes Visit the GARMIN website for current updates and supplemental i
5. Pico Sao Jorge and Terceira Islands Azores TIMBALAI 1948 Brunei and East Malaysia Sarawak and Sabah TOKYO Japan Korea Okinawa TRISTAN ASTRO 1968 Tristan da Cunha User defined earth datum VITI LEVU 1916 Viti Levu Island Fiji Islands WAKE ENIWETOK 1960 Marshall Islands WORLD GEODETIC SYSTEM 1972 WORLD GEODETIC SYSTEM 1984 ZANDERIJ Surinam CH 1903 Switzerland Hu Tzu Shan Indonesia 74 Austria Potsdam Taiwan modified Hu Tzu Shan 27 Reference Index A Antenna Mount 6 7 Autoz TUNING c odds epum 10 B Baud Rate 3 SR eee 8 11 Beacon Range mlg Beacon Reference Card 5 BACON Systemi a coercet 20 C CapablDties nete te stets 5 CAULIODSi ero coh t en eret iens 2 Gompatibility iier 5 Connections Wiring Contents Package sss D Dat ms cere eei 25 21 DGPS System seem 20 E Earth Datums sse Error Sources of Extension Cable F Pr QUEHCIeS c sepe 10 20 G GPS SVSIETIL Loser tuner tenens 19 I Tnstallatioriz eee e eed 6 0 Interference sse 6 7 28 M anual Tuning 13 ounting the Receiver 6 9 N MEA 1 nonet eite tet tener RI 10 24 MEA Received Sentences 11 13 MEA Transmited Sentences 14 18 o On OSwitehies anasi alias 6 8 9 One Pulse Per Second Output
6. Serial Connector Power Data Cable Figure 4 Wiring a DB9 Serial Connector To the DGPS 53 EE dq DGPS 53 8 35 VDC Power Data Cable Remote Power Switch 1 RED 8 35 VDC 4 2 BLACK GROUND Closed ON 5 WHITE REMOTE ON OFF Open OFF f AN Switch Figure 5 Wiring a Remote Power Switch For the DGPS 53 10 Operation Using the DGPS 53 First Time Fix Once the DGPS is installed and powered on it will begin to search for satellites and a DGPS beacon signal Initially it may take longer than normal to scan through he DGPS beacon frequencies The DGPS 53 will output corrected navigation data once it has calculated an initial position fix and sucessfully received a DGPS signal The ollowing data will be output in NMEA 0183 Version 2 0 ormat e Latitude Longitude Altitude Velocity e Date Time Error Estimates Satellite and Receiver Status e DGPS Beacon Information Auto Tuning Without external commands the DGPS 53 will automatically scan frequencies between 283 5 325 0 kHz 0 5kHz steps for 100 and 200 bps stations only To use 25 amp 50 bps you will need to manually tune the DGPS 53 pg 13 via the chartplotter PC or other compatible source The DGPS 53 should tune into a DGPS station within about 10 minutes The unit will store the last used frequency in non volatile memory and default to that frequency on next use If you lose DGPS s
7. 638 2626 252 638 4885 FAX www nmed org Radio Technical Commission For Maritime Services RTCM 1800 Diagonal Road Suite 600 Alexandria VA 22314 2480 USA 703 684 4481 Info Only 703 836 4229 FAX www rtcm org 24 Physical Size Weight Operating Range Waterproof Mount Thread Size Power Voltage Current Drain Signal Processing Frequency Range Data Rates Auto Tuning Minimum Signal Data Processing Demodulation MSK Bit Rates Interfaces Input Input Sentences Output Output Sentence Pulse Per Second 4 6 W x 5 3 H 117mm x 135mm 23 9 ounces 0 678 kg 68 F to 158 F 20 C to 70 C 1 meter submersion for 30 minutes IPX7 rating for IEC529 1 diameter at 14 threads inch 8 35 vDC using supplied power data cable Surge and reverse polarity protected for up to 80 vDC 95 mA Q 12 vDc 283 5 325 0 kHz 0 5kHz 200 100 50 25 BPS All 200 amp 100 BPS Channels 10 pV MSK Minimum Shift Keying 25 50 100 200 bps RS 232 or NMEA 0183 4800 baud Binary Magnavox PSLIB Starlink RS 232 4800 baud RTCM SC 104 6 of 8 bit format NMEA 0183 version 2 0 One Pulse Per Second accuracy 1 microsecond at rising edge of PPS pulse Appendix A Earth Datums The following is a list of the GARMIN DGPS 53 earth datum indexes and the corresponding earth datum name including the area of application 0 ADINDAN Ethiopia Mali Senegal Sudan AFGOOYE S
8. SPGRMO GPAL M I will cause the sensor board to transmit all stored almanac information All other NMEA sentence transmission will be temporarily suspended Tune DGPS Beacon Receiver PSLIB The PSLIB sentence provides the ability to manually tune the DGPS 53 PSLIB lt 1 gt lt 2 gt hh lt CR gt lt LF gt 1 Beacon tune frequency 0 0 283 5 325 0 kHz in 0 5 kHz steps lt 2 gt Beacon bit rate 0 25 50 100 or 200 bps If valid data is received the DGPS 53 will store it in the EEPROM and echo the PSLIB command to the beacon receiver At power up or external reset any stored frequency other than 0 0 causes the DGPS 53 to automatically tune 13 Operation Using the DGPS 53 NMEA Transmitted Sentences This section defines the sentences which can be output by the DGPS 53 GPALM GPGGA GPGSA GPGSV GPRMC GPVTG PGRME PGRMT PGRMV PGRME LCGLL LCVTG Sentence Transmission Rate Sentences are transmitted with respect to the user selected baud rate Regardless of the selected baud rate the information transmitted by the DGPS 53 is referenced to the one pulse per second output pulse immediately preceding the GPRMC sentence The maximum number of fields allowed in a single sentence is 82 characters including delimiters Values in the table include the sentence start delimiter character and the termination delimiter lt CR gt lt LF gt The factory set defaults will result in a once per second t
9. of these lines exist connect the BLACK wire from the power data cable to it Connecting the DGPS 53 The final step in installing the DGPS 53 is to connect the receivers DATA IN DATA OUT REMOTE ON OFF and GROUND Return lines to your chartplotter or PC The DGPS 53 is designed to transmit receive data at 4800 19200 baud bits per second which is suitable for use with most devices and PCs For reliable communication it is essential that the DGPS 53 and the receiving device share the same ground This ground connection acts as the current Return line It is recommended to wire the unit to it s own circuit to avoid interference from other electronics 1 P You may reference Figures 3 or 4 on the following page for the wiring Connect the BLUE Data Out wire from the DGPS 53 s power data cable to the DATA INPUT line of the chartplotter or to pin 2 on the DB9 pin 3 on DB25 Connect the BROWN Data In wire to the DATA OUTPUT line of the chartplotter or pin 3 on the DB9 pin 2 on DB25 Connect the BLACK wire to the GROUND wire of the chartplotter or pin 5 on the DB9 pin 7 on DB25 If the BLACK wire is already connected to the same ground terminal as the GPS unit no additional connection is required unless a separate RETURN line is provided by the GPS unit Connect the RED wire from the power data cable to a 8 35 VDC power source If a remote power switch is being installed referen
10. s iconscimsenmiettes 10 NMEA Sentences One Pulse Per Second Output 18 Reference GPS How It Works sss DGPS How It Works Sources of ETTOE ssepe Troubleshooting Chart s 23 DGPS 53 Specifications iaronn 24 Appendix A Earth Datums 25 27 IMG exer caccia dh cilia tete orte tad 28 Introduction Table of Contents Introduction Product Registration Why should you register your GARMIN GPS unit Notification of Product Updates Notification of New Products Lost or Stolen unit tracking Customer Service Product Registration Help us better support you by completing our on line registration today Have the serial number of your DGPS 53 handy and connect to our website www garmin com Look for the Product Registration link on the Home page If you have previously registered a GARMIN product purchase using a mail in registration card we invite you to reregister using our NEW on line system Many services provided by our new product registration system are now being automated and reregistering your purchase ensures you the best possible support from GARMIN Serial Number Use this area to record the serial number 8 digit number located on the bottom of the unit in case it is lost stolen or needs service Be sure to keep your original sales receipt in a safe place or attach a photocopy inside the manual Serial Number The GA
11. secure the antenna mount at the desired mounting location EMI Electromagnetic Interference from engine components 2 Make sure the DGPS 53 is aligned properly to avoid thread damage Thread the DGPS 53 onto the antenna mount and hand tighten clockwise until snug Fig 1 Do not overtighten 3 Align the notches on the power data cable and DGPS 53 connector and push the connector in until it seats Turn the locking ring clockwise until the power data cable is firmly locked into position 4 Route the power data cable from the DGPS 53 to the GPS unit Excess cable may be shortened or coiled Antenna Power Data together and secured in an inconspicuous location If Mount Cable amp additional cable is needed you may use GARMIN s Connectors optional 60 cable 010 10284 00 or similar 24 Figure 1 Mounting AWG shielded wiring The entire length of the the DGPS 53 power data cable should not exceed 150 45 7m Installation Connecting the DGPS 53 If the DGPS 53 is being connected to a PC a DB9 or DB25 serial connector normally female will be needed Check with a PC or electronics supplier for this item 54321 9876 DB9 Female Serial Connector 13 7 321 O OOOOOOOOOOOCOO Oo 000000000000 25 14 DB25 Female Serial Connector Some non GARMIN devices may have a separate data line labeled RETURN DATA GROUND or DATA If one
12. sentence PGRMB reports DGPS beacon information PGRMB lt 1 gt lt 2 gt lt 3 gt lt 4 gt lt 5 gt K lt CR gt lt LF gt Beacon tune frequency 0 0 283 5 325 0 kHz in 0 5 kHz steps Beacon bit rate 0 25 50 100 or 200 bps Beacon SNR 0 to 31 Beacon data quality 0 to 100 lt b lt 2 gt lt 3 gt lt 4 gt 5 Distance to beacon reference station in kilometers One Pulse Per Second Output D 18 The highly accurate within 1ms one pulse per second PPS output is provided for applications equiring precise calculated and co of each GPS second Regardless of the pulse immedia The accuracy o ix To obtain the ocal time re The default pulse between 20 msec and 980 msec as described in PGRMC on page 12 timing measurements The signal is generated after the initial position fix has been ntinues until power down The rising edge of the signal is synchronized to the start selected baud rate the information transmitted by the DGPS 53 is referenced to the ely preceding the NMEA 0183 RMC sentence f the PPS output is maintained only while the DGPS 53 can compute a valid position most accurate results the one pulse per second output should be calibrated against erence to compensate for cable and internal receiver delays and the local time bias width is 100 msec however it may be programmed in 20 msec increments Reference GPS How It Works The global positioning system is
13. the GPS receiver Multipath error can be minimized by mounting the GPS antenna at a location which minimizes the potential for reflected signals Generally the GPS antenna should be mounted on a large flat horizontal surface and away from any vertical structure cabin walls large mast etc which could reflect the GPS signal 21 22 Reference Sources of Error Number of Satellites Visible As previously stated the number of satellites available can affect position accuracy To apply the corrections provided for the satellites received at the beacon transmitter station the same satellites at least in part must be received by your GPS receiver And certainly if there aren t enough satellites to determine a GPS position there arent enough satellites to calculate a DGPS position Atmospheric Conditions Differences in the ionosphere and or troposphere between the DGPS broadcast station and the DGPS receiver can result in decreased position accuracy Although this does not cause significant error the amount of error can increase as you get further away from the DGPS broadcast station Satellite Geometry A minimum of 4 satellites are required to determine a 3D position At times additional satellites are required due to their placement with respect to each other This relative placement is referred to as satellite geometry Ideal satellite geometry exists when the satellites are located at wide angles wi
14. will be transmitted ode indicator only output if NMEA 2 30 active A Autonomous D Differential E Geographic Position with LORAN Talker ID LCGLL The LCGLL sentence reports position infor mation LCGLL lt 1 gt lt 2 gt lt 3 gt lt 4 gt lt 5 gt lt 6 gt lt 7 gt lt CR gt lt LF gt lt b lt 2 gt lt 3 gt lt 4 gt 5 6 i 16 Latitude ddmm mmmm format lead Latitude hemisphere N or S Longitude dddmm mmmm format 1 Longitude hemisphere E or W ing zeros will be transmitted eading zeros will be transmitted UTC time of position fix hhmmss format Status A Valid position V NAV receiver warning Mode indicator only output if NMEA 2 30 active A Autonomous D Differential E Estimated N Data not valid Operation Track Made Good and Ground Speed with LORAN Talker ID LCVTG The LCVTG sentence reports track and velocity information Usi ng the LCVTG lt 1 gt T lt 2 gt M lt 3 gt N lt 4 gt K lt 5 gt lt CR gt lt LF gt DGPS 53 lt l gt True course over ground 000 to 359 degrees leading zeros will be transmitted lt 2 gt Magnetic course over ground 000 to 359 degrees leading zeros will be transmitted lt 3 gt Speed over ground 000 0 to 999 9 knots leading zeros will be transmitted lt 4 gt Speed over ground 0000 0 to 1851 8 kilometers per hour leading zeros will be transmitted lt 5 gt Mode indicator only output if NMEA 2 30 act
15. 3 gt lt 14 gt hh lt CR gt lt LF gt lt l gt Fix mode A automatic 2 2D exclusively host must supply altitude 3 3D exclusively 2 Altitude above below mean sea level 1500 0 to 18000 0 meters 3 Earth datum index If the user datum index 96 is specified fields 4 through 8 must contain valid values Otherwise fields lt 4 gt through lt 8 gt must be null Refer to Appendix A for a list of earth datums and the corresponding earth datum index 4 User earth datum semi major axis 6360000 0 to 6380000 0 meters 001 meters resolution 5 User earth datum inverse flattening factor 285 0 to 310 0 10 resolution 6 User earth datum delta x earth centered coordinate 5000 0 to 5000 0 meters 1 meter res T User earth datum delta y earth centered coordinate 5000 0 to 5000 0 meters 1 meter res 8 User earth datum delta z earth centered coordinate 5000 0 to 5000 0 meters 1 meter res 9 Differential mode A automatic output DGPS data when available non DGPS otherwise D differential exclusively output only differential fixes 10 NMEA Baud rate 1 1200 2 2400 3 4800 4 9600 5 19200 6 300 7 2600 11 Velocity filter 0 No filter 1 Automatic filter 2 255 Filter time constant 10 10 second ilter lt 12 gt PPS mode 1 No PPS 2 1 Hz lt 13 gt PPS pulse length 0 48 n 1 20msec Example n 4 gt 100 msec pulse 14 Dead reckoning valid time 1 30 se
16. RMIN DGPS 53 has no user serviceable parts Should you ever encounter a problem with your unit please contact your GARMIN dealer or GARMIN Customer Service 913 397 8200 or 800 800 1020 for repairs Repairs should only be made by an authorized GARMIN service center Unauthorized repairs or modifications could void your warranty and authority to operate this device under FCC Part 15 regulations See page 1 of this manual for further service details Overview Capabilities The DGPS 53 offers a host of powerful capabilities for enhanced performance and accuracy Capabilities amp Package Contents Performance 12 channel GPS receiver tracks and uses up to 12 satellites for fast accurate positioning Single channel DGPS receiver has high sensitivity automatic and manual tuning throughout the beacon broadcast band Ease of Use Once installed unit will automati cally transmit navigation data Convenience May be remotely mounted in an out of the way location Receiver status information is displayed directly on the chartplotter or PC Low Power Consumption Draws approximately 170 milliamps during normal operation Accuracy 1 5 2DRMS meters typical Package Contents Your GARMIN DGPS 53 package includes DGPS 53 unit 30 Power Data Cable Owners Manual amp Reference Guide Beacon Reference Card If any parts are missing or dam
17. a satellite based GPS navigation system consisting of a network of 24 orbiting How It Works satellites that are twelve thousand miles in space and in six different orbital paths The satellites are constantly moving and you can receive satellite signals anywhere in the world at any time The GPS signal contains a pseudo random code ephemeris pronounced ee fem er is and almanac data This code identifies which satellite is transmitting in other words an I D code We refer to satellites by their PRN pseudo random number from 1 through 32 Ephemeris data is constantly transmitted by each satellite and contains important information such as status of the satellite current date and time The almanac data tells the GPS receiver where each GPS satellite should be at any time throughout the day Each satellite transmits almanac data showing the orbital information for that satellite and for every other satellite in the system Each satellite transmits a message which essentially says Tm satellite X my position is currently Y and this message was sent at time Z Of course this is a gross oversimplification but you get the idea The GPS receiver reads the message and saves the data for continual use Now to determine your position the GPS receiver compares the time a signal was transmitted by a satellite with the time it was received by the GPS receiver The ime difference tells the GPS r
18. aged please contact your GARMIN dealer immediately Installation Mounting the DGPS 53 Note As a general rule mount the receiver at least three feet from all other antennas and the vessels electrical system components alternator ignition system Mounting the Receiver Please read through these instructions thoroughly before attempting installation Mahe sure you completely understand these instructions before you begin When in doubt seek professional assistance The following additional items are needed or optional to complete the installation of your DGPS 53 Antenna mount Since antenna mounting locations and methods vary you will need to obtain an antenna mount to install the DGPS 53 The receiver base fits a standard 1 inch 14 threads per inch mount Check with your GARMIN dealer or a marine supply retailer for this item On Off switch optional Power to the receiver may be controlled by an on off switch such as an accessory switch on the control console Check with your GARMIN dealer or a marine electric supply retailer for this item GARMIN 60 Power Data Cable for cable installation lengths greater than 30 Part number 010 10284 00 It is recommended that the system be temporarily hooked up with the wiring and the unit placed at the desired installation location Then check operation with potential interfering equipment turned on and off For example other electronic equipment fan moto
19. c 12 Operation All configuration changes take effect after receipt of a valid value except baud rate and PPS mode Baud rate and PPS mode changes take effect on the next power cycle Using the Output Sentence The PGRMO seni specific output sentences DGPS 53 Enable Disable PGRMO ence provides the ability to enable and disable The following sentences are enabled at the factory GPGGA GPGSA GPGSV GPRMC and PGRMT PGRMO lt 1 gt lt 2 gt hh lt CR gt lt LF gt lt l gt Target sentence description e g PGRMT GPGSV etc 2 Target sentence mode where 0 disable specified sentence 1 enable specified sentence ll output sentences 3 enable all 2 disable a output sentences except GPALM The following notes apply to the PGRMO input sentence 1 If the target seni not checked for va ence mode is 2 disable all or 3 enable all the target sentence description is idity In this case an empty field is allowed e g PGRMO 3 or the mode field may contain from 1 to 5 characters 2 If the target sen must be an identifi 3 If either th e ence mode is 0 disable or 1 enable the target sentence description field er for one of the sentences being output by the DGPS 53 arget sentence mode field or the target sentence description field is not valid the PGRMO sentence will have no effect 4
20. ce Figure 5 for wiring the switch This will allow the DGPS 53 to remain connected to a power source but manually powered on and off Otherwise if the receiver is being wired to a circuit which is already switched with the chartplotter for example connect the WHITE wire to the same place as the BLACK wire When the BLACK and WHITE wires are combined the DGPS 53 will turn on off when power is applied removed to the RED and BLACK wires If one pulse per second PPS output is being used connect the YELLOW and BLACK wires to your desired device inputs See page 18 for more information on PPS Installation Connecting the DGPS 53 h d O 09 E DGPS 53 Power Data Cable amp Chartplotter 8 39VDO Chartplotter Connection 1 RED 8 35 VDC GROUND 2 BLACK GROUND l 5 WHITE REMOTE ON OFF 4 BROWN DATA IN 3 BLUE DATA OUT 6 GREEN DGPS STATUS LED DGPS 53 e D YELLOW PPS Power Data Cable DATA OUT DATA IN Figure 3 Wiring a Chartplotter To the DGPS 53 Fuse DG PS 53 6A Power Data Cable amp 8 35VDC S DB 9 Serial Connection 1 RED 8 35 VDC PIN 5 GROUND 2 BLACK GROUND SIN SPATA DUE 1 5 WHITE REMOTE ON OFF e _ 4 BROWN DATA IN PIN 2 DATA IN e 9 BLUE DATA OUT 6 GREEN DGPS STATUS LED e DB 9 e D YELLOW PPS DG PS 53
21. dilution of precision 0 to 9 rounded to nearest integer value 15 gt Time dilution of precision 0 to 9 rounded to nearest integer value Sensor Status Information PGRMT The GARMIN Proprietary sentence PGRMT gives information concerning the status of the DGPS 53 This sentence is transmitted once per minute regardless of the selected baud rate 17 Operation Using DGPS the 53 PGRMT lt 1 gt lt 2 gt lt 3 gt lt 4 gt lt 5 gt lt 6 gt lt 7 gt lt 8 gt lt 9 gt hh lt CR gt lt LF gt lt b lt 2 gt lt 3 gt lt 4 gt 5 6 i 8 9 3D velocity Information PGRMV Product m Receiver fai Real time c Oscillator d Data collec Board temperature in degrees C Board confi odel and software version ROM checksum test P pass F fail lure discrete P pass F fail Stored data lost R retained L lost ock lost R retained L lost rift discrete P pass F excessive drift detected ion discrete C collecting null if not collecting guration data R retained L lost The GARMIN Proprietary sentence PGRMV reports three dimensional velocity information PGRMV lt 1 gt lt 2 gt lt 3 gt hh lt CR gt lt LF gt l True east velocity 514 4 to 514 4 meters second lt 2 gt True north velocity 514 4 to 514 4 meters second 3 Up velocity 999 9 to 9999 9 meters second DGPS Beacon Information PGRMB The GARMIN proprietary
22. eceiver how far away that particular satellite is If we add distance measurements rom a few more satellites we can determine our position This is what a GPS receiver does With a minimum of hree or more satellites your GPS receiver can determine a latitude longitude position whats called a 2D position ix With four or more satellites a GPS receiver can determine a 3D position which includes latitude ongitude and altitude By continuously updating your position a GPS receiver can also accurately provide speed and direction of travel 19 Reference DGPS How It Works The DGPS 53 has the GPS and DGPS receivers combined within the same housing 20 DGPS How It Works Differential GPS DGPS is a technique used to improve the accuracy of the Global Positioning System DGPS reduces the effects of ionospheric variations and can improve position accuracy typically to 1 5 meters The DGPS Beacon Transmitter is placed at a known location i e the exact position of the site has been previously determined At the beacon transmitter site the GPS satellites are monitored using a GPS receiver This receiver is equipped to calculate corrections for each satellite received The correction is the difference between the distance to the satellite from the beacon site as measured by the GPS receiver and the actual distance to the satellite based on the known location of the beacon site These corrections are communicated
23. ignal the unit will attempt to reconnect to the last frequency and if necessary tune to another station Interfaces The DGPS 53 interface protocol design is based on the National Marine Electronics Association s NMEA 0183 ASCII interface specification which is fully defined in NMEA 0183 Version 2 0 and the Radio Technical Commission for Maritime Services RTCM Recom mended Standards For Differential Navstar GPS Service Version 2 1 RTCM Special Committee No 104 Contact information to obtain copies of these specifications may be found on page 24 The DGPS 53 interface protocol also transmits additional information using the conven tion of GARMIN proprietary sentences PGxxx The following sections de scribe the NMEA data format of each sentence transmitted and received by the DGPS 53 The baud rate selec second output interfaces are a tion and one pulse per lso described NMEA Received sentences This section defines the sentences which can be parameter All sentences received by eceived by the DGPS 53 Null fields in the configuration sentence indicate no change in the particular configuration he DGPS 53 must be erminated with lt CR gt lt LF gt press ENTER but do not equire the checksum hh The checksum is used for parity checking data and it is recommended that the checksum be used in environments containing high electromagnetic noise It is ge normal PC envi
24. ive A Autonomous D Differential E Estimated N Data not valid Estimated Error Information PGRME The GARMIN Proprietary sentence PGRME reports estimated position error information PGRME lt 1 gt M lt 2 gt M lt 3 gt M hh lt CR gt lt LF gt lt l gt Estimated horizontal position error HPE 0 0 to 999 9 meters lt 2 gt Estimated vertical position error VPE 0 0 to 999 9 meters lt 3 gt Estimated position error EPE 0 0 to 999 9 meters GPS Fix Data Sentence PGRMF The sentence PGRMF is GARMIN Proprietary format reporting time position speed and course information PGRMF lt 1 gt lt 2 gt lt 3 gt lt 4 gt lt 5 gt lt 6 gt lt 7 gt lt 8 gt lt 9 gt lt 10 gt lt 11 gt lt 12 gt lt 13 gt lt 14 gt lt 5 gt hh lt CR gt lt LF gt lt l gt GPS week number 0 1023 2 GPS seconds 0 604799 lt 3 gt UTC date of position fix ddmmyy format lt 4 gt UTC time of position fix hhmmss format 5 GPS leap second count 6 Latitude ddmm mmmm format leading zeros will be transmitted T Latitude hemisphere N or S 8 Longitude dddmm mmmm format leading zeros will be transmitted 9 Longitude hemisphere E or W 10 Mode M manual A automatic 11 Fix type 0 no fix 1 2D fix 2 3D fix 12 Speed over ground 0 to 1851 kilometers hour 13 Course over ground 0 to 359 degrees true H Vv Vv 14 gt Position
25. n used to initialize the position and time used for satellite acquisition Receipt of this sentence by the DGPS 53 causes the software to restart the satellite acquisition process If there are no errors in the sentence it will be echoed upon receipt If an error is detected the echoed PGRMI sentence will contain the current default values Current PGRMI defaults can also be obtained by sending PGRMIE to the board PGRMI lt 1 gt lt 2 gt lt 3 gt lt 4 gt lt 5 gt lt 6 gt lt 7 gt hh lt CR gt lt LF gt l Latitude ddmm mmm format leading zeros must be transmitted 2 Latitude hemisphere N or S 3 Longitude dddmm mmm format leading zeros must be transmitted 4 Longitude hemisphere E or W 5 Current UTC date ddmmyy format 6 Current UTC time hhmmss format lt T gt Receiver Command A Auto Locate R Unit Reset Sensor Configuration Information PGRMC The PGRMC sentence provides information used to configure the DGPS53 Configuration parameters are stored in non volatile memory and retained between power cycles The DGPS 53 will echo this sentence upon its receipt if no errors are detected If an error is detected the echoed PGRMC sentence will contain the current default values Current default values can also be obtained by sending PGRMCE to the board PGRMC lt 1 gt lt 2 gt lt 3 gt lt 4 gt lt 5 gt lt 6 gt lt 7 gt lt 8 gt lt 9 gt lt 10 gt lt 11 gt lt 12 gt lt 1
26. nformation concerning the use and operation of this and other GARMIN products Website address www garmin com GARMIN and DGPS 53 are registered trademarks of GARMIN Corporation and may not be used without the express permission of GARMIN Corporation September 2000 Part Number 190 00194 00 Rev A Printed in Taiwan Introduction GARMIN Corporation warrants this product to be free from defects in materials and workmanship for one year from the date of purchase GARMIN will at its sole option repair or replace any components that fail in normal use Such repairs or replacement will be made at no charge to the customer for parts or labor The customer is however responsible for any transportation costs This warranty does not cover failures due to abuse misuse accident or unauthorized alteration or repairs THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN LIEU OF ALL OTHER NI Limited Warranty WARRANTIES EXPRESS OR IMPLIED OR STATUTORY INCLUDING ANY LIABILITY ARISING UNDER ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A user serviceable parts Should PARTICULAR PURPOSE STATUTORY OR OTHERWISE you ever encounter a problem THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS with your receiver please contact The GARMIN DGPS 53 has no WHICH MAY VARY FROM STATE TO STATE your GARMIN dealer or the IN NO EVENT SHALL GARMIN BE LIABLE FOR ANY GARMIN Customer Service i department 913 397 8200
27. ns when the best possible accuracy will not occur Several factors can contribute to a degraded DGPS accuracy Loss of DGPS Beacon Signal Obviously the lack of DGPS correction data will result in reduced accuracy Accuracy will be the same as if no beacon receiver was being used Several conditions can cause a loss of the beacon signal Sources of Error Poor data exchange between DGPS receiver and the GPS receiver can result in intermittent or nonexistent correction data The range of a DGPS beacon transmitter see the accompanying Beacon Reference Card is typically a few hundred miles or less Beyond this range the beacon signal cannot be reliably received Interference to the beacon signal can be experi enced during periods of thunderstorm activity Other sources of interference such as alternator motors ignition systems and VHE can also affect signal reception Alternator ignition interference can be minimized through proper shielding of the ships wiring by using an EMI RFI filter and by mounting the beacon receivers antenna away from these sources of interference Multipath Multipath error occurs when the GPS signal is reflected before it reaches the GPS receiver The reflected signal takes slightly longer to reach the GPS receiver than a non reflected signal This added time delay results in position error The distance to each satellite is calculated based upon the time it takes the GPS signal to reach
28. omalia AIN EL ABD 1970 Bahrain Island Saudi Arabia ANNA 1 ASTRO 1965 Cocos Island ARC 1950 Botswana Lesotho Malawi Swaziland Zaire Zambia Zimbabwe ARC 1960 Kenya Tanzania ASCENSION ISLAND 1958 Ascension Island ASTRO BEACON E Iwo Jima Island AUSTRALIAN GEODETIC 1966 Australia Tasmania Island AUSTRALIAN GEODETIC 1984 Australia Tasmania Island ASTRO DOS 71 4 St Helena Island ASTRONOMIC STATION 1952 Marcus Island ASTRO B4 SOROL ATOLL Tern Island BELLEVUE IGN Efate and Erromango Islands BERMUDA 1957 Bermuda Islands BOGOTA OBSERVATORY Colombia CAMPO INCHAUSPE Argentina CANTON ASTRO 1966 Phoenix Islands CAPE CANAVERAL Florida Bahama Islands CAPE South Africa CARTHAGE Tunisia CHATHAM 1971 Chatham Island New Zealand CHUA ASTRO Paraguay CORREGO ALEGRE Brazil DJAKARTA BATAVIA Sumatra Island Indonesia DOS 1968 Gizo Island New Georgia Islands EASTER ISLAND 1967 Easter Island OMAN DU BW F2 e pecie H N H 09 e Dw e H F co N N h O o N mn N NNN Ui A U N N lon N 28 29 30 31 32 EUROPEAN 1950 Austria Belgium Gibraltar Greece Italy Luxembourg Sweden Switzerland EUROPEAN 1979 Austria Finland Switzerland FINLAND HAYFORD 1910 Finland GA GEODETIC DATUM 1949 New Zea ORDNANCE SURVEY OF GREAT BR Scotland Shetland Islands Wales Denmark Finland France Germany e
29. or INCIDENTAL SPECIAL INDIRECT OR CONSEQUEN 800 800 1020 for repr TIAL DAMAGES WHETHER RESULTING FROM THE Any attempt to open Reus USE MISUSE OR INABILITY TO USE THIS PRODUCT change or modify the unit in any OR FROM DEFECTS IN THE PRODUCT SOME STATES way will void your warranty and DO NOT ALLOW THE EXCLUSION OF INCIDENTAL OR Ma result in permanent damage CONSEQUENTIAL DAMAGES SO THE ABOVE ae esi LIMITATIONS MAY NOT APPLY TO YOU To obtain warranty service contact your GARMIN dealer or call the GARMIN Customer Service department 913 397 8200 for a returned merchandise tracking number The unit should be securely packaged with the tracking number clearly marked on the outside of the package and sent freight prepaid and insured to a GARMIN warranty service station A copy of the original sales receipt is required as the proof of purchase for warranty repairs GARMIN retains the exclusive right to repair or replace the unit or software or offer a full refund of the purchase price at its sole discretion SUCH REMEDY SHALL BE YOUR SOLE AND EXCLUSIVE REMEDY FOR ANY BREACH OF WARRANTY Introduction All differential beacon receivers decode correction data Cautions determined at the beacon transmitter site via a GPS receiver s The GPS system is operated by the govern ment of the United States which is solely responsible for their accuracy and maintenance The DGPS beacon transmitters are operated by the U S Coa
30. osition V NAV receiver warning Latitude ddmm mmmm format leading zeros will be transmitted lt b lt 2 gt lt 3 gt lt 4 gt 5 6 i 8 9 10 ll 12 Track Made Goo Latitude hemisphere N or S Longitude dddmm mmmm format leading zeros will be transmitted Longitude hemisphere E or W Speed over ground 000 0 to 999 9 knots leading zeros will be transmitted Course over ground 000 0 to 359 9 d egrees true leading zeros will be transmitted UTC date of position fix ddmmyy format Magnetic variation 000 0 to 180 0 degrees leading zeros will be transmitted Magnetic variation direction E or W Mode indicator only output if NMEA Estimated N Data not valid westerly variation adds to course over ground 2 30 active A Autonomous D Differential E d and Ground Speed with GPS Talker ID VIG The GPVTG sentence reports track and velocity information with a checksum GPVIG lt 1 gt T lt 2 gt M lt 3 gt N lt 4 gt K lt 5 gt hh lt CR gt lt LF gt lt l gt lt 2 gt lt 3 gt lt 4 gt lt 5 gt Speed over ground 0000 0 to 1851 8 Estimated N Data not valid True course over ground 000 to 359 degrees leading zeros will be transmitted agnetic course over ground 000 to 359 degrees leading zeros will be transmitted Speed over ground 000 0 to 999 9 knots leading zeros will be transmitted kilometers per hour leading zeros
31. ransmission at the NMEA specification transmission rate of 4800 baud Transmitted Time The DGPS 53 outputs UTC Coordinated Universal Time date and time of day in the transmitted sentences Prior to the initial position fix the date and time of day are provided by the on board clock After the initial position fix the date and time of day are calculated using GPS satellite information and are synchronized with the one pulse per second output The DGPS 53 uses information obtained from the GPS satellites to add or delete UTC leap seconds and correct the transmitted date and time of day Global Positioning System Almanac Data ALM GPALM lt 1 gt lt 2 gt lt 3 gt lt 4 gt lt 5 gt lt 6 gt lt 7 gt lt 8 gt lt 9 gt lt 10 gt lt 11 gt lt 12 gt lt 13 gt lt 145 lt 15 gt hh lt CR gt lt LF gt Almanac sentences are not normally transmitted Almanac transmission can be initiated by sending the sensor board a PGRMO GPALM 1 command Upon receipt of this command the sensor board will transmit available almanac information on GPALM sentences During the transmission of almanac sentences other NMEA data output will be temporarily suspended Reference the Alamanac ALM sentence on page 11 for field information 14 Operation Global Positioning System Fix Data GGA GPGGA lt 1 gt lt 2 gt lt 3 gt lt 4 gt lt 5 gt lt 6 gt lt 7 gt lt 8 gt lt 9 gt M lt 10 gt M lt 11 gt lt 12 gt hh lt CR gt lt LF gt
32. ronments Sen lt CR gt lt LF gt after any data field nerally not required in tences may be truncated by and valid fields up to that point will be acted on by the DGPS 53 Almanac Information ALM GPAL hh lt CR gt lt LF gt Operation Using the DGPS 53 NMEA Received sentences GPALM PGRMI PGRMC PGRMO PSLIB lt 1 gt lt 2 gt lt 3 gt lt 4 gt lt 5 gt lt 6 gt lt 7 gt lt 8 gt lt 9 gt lt 10 gt lt 1 gt lt 12 gt lt 13 gt lt 14 gt lt 15 gt The GPALM sentence can be used to replace the DGPS 535 stored almanac information if battery back up has failed lt l gt Total number of ALM sentences to be transmitted by the sensor board during almanac download This field can be null or any number when sending almanac to the sensor board lt 2 gt Number of current ALM sentence This field can be null or any number when sending almanac to the sensor board 3 Satellite PRN number 01 to 32 4 GPS week number 5 SV health bits 17 24 of each almanac page lt 6 gt Eccentricity lt 7 gt Almanac reference time lt 8 gt Inclination angle 9 Rate of right ascension 10 Root of semi major axis 11 Omega argument of perigee 12 Longitude of ascension node 13 Mean anomaly 14 af0 clock parameter 15 afl clock parameter 11 Operation Using the DGPS 53 Sensor Initialization Information PGRMI The PGRMI sentence provides informatio
33. rs engine ignition alternators generators radars and VHF radio transmissions can be sources of interference ce Position the receiver so that the clearest possible view of the sky and horizon in all directions is obtained Avoid mounting the antenna next to large areas of conductive material metal aluminum etc as this may cause poor signal reception The DGPS 53 is supplied with a 30 feet power data cable When routing the wiring to the DGPS 53 avoid routing the cable near the vessels alternator or ignition system components or parallel to other power lines Installation Three common sources of interference for DGPS units are N Mounting the G ABOVE OK Receiver J a BELOW OK en 3r Radar VHF Radio Antenna A When routing the power data cable try to avoid Sharp edges which may cut the cable a Routing the cable parallel to other power lines e Excessively twisting straining or If a problem is found try altering the location of the bending the cable unit or wiring Often moving the antenna a few feet away from the source of interference will solve the problem When a suitable configuration is found a permanent installation should be made Select the mounting location according to your preferences Keep in mind that from this mounting location cables will be routed to the antenna and to the GPS unit 1 Once a suitable mounting location has been determined and tested
34. s will be transmitted Position dilution of precision 0 5 to 99 9 Horizontal dilution of precision 0 5 to 99 9 Vertical dilution of precision 0 5 to 99 9 GPS Satellites in View GSV GPGSV lt 1 gt lt 2 gt lt 3 gt lt 4 gt lt 5 gt lt 6 gt lt 7 gt lt 4 gt lt 5 gt lt 6 gt lt 7 gt hh lt CR gt lt LF gt lt l gt lt 2 gt lt 3 gt lt 4 gt lt 5 gt lt 6 gt lt i gt Total number of GSV sentences to be transmitted Number of current GSV sentence Total number of satellites in view 00 to 12 leading zeros will be transmitted Satellite PRN number 01 to 32 leading zeros will be transmitted Satellite elevation 00 to 90 degrees leading zeros will be transmitted Satellite azimuth 000 to 359 degrees true leading zeros will be transmitted Signal to noise ratio C No 00 to 99 dB null when not tracking leading zeros will be transmitted NOTE Items lt 4 gt lt 5 gt lt 6 gt and lt 7 gt repeat for each satellite in view to a maximum of four 4 satellites per sentence Additional satellites in view information must be sent in subsequent sentences These fields will be null if unused 15 Operation Using the DGPS 53 Recommended Minimum Specific GPS TRANSIT Data RMC GPRMC lt 1 gt lt 2 gt lt 3 gt lt 4 gt lt 5 gt lt 6 gt lt 7 gt lt 8 gt lt 9 gt lt 10 gt lt 11 gt lt 12 gt hh lt CR gt lt LF gt UTC time of position fix hhmmss format Status A Valid p
35. st Guard or similar government agency in other countries which is responsible for their accuracy and maintenance The Global Positioning System and the Differential Global Positioning System are under development and are subject o changes which could affect accuracy and performance of all GPS DGPS equipment Although a GPS DGPS system is a precision electronic NAVigation AID NAVAID any NAVAID can be misused or misinterpreted and therefore become unsafe Use the GPS DGPS system at your own risk To reduce this risk carefully review and understand all aspects of this Owners anual and carefully compare indications from your display to all available navigation sources including the information from other NAVAIDS visual sightings charts etc For safety always resolve any discrepancies before continuing navigation NOTE This device complies with Part 15 of the FCC rules Operation of this device is subject to the following conditions 1 This device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation Introduction Limited Warranty l OCULI 2 Table of Contents sssssssssess 3 Product Registration ssssssss 4 Overview Capabilities amp Package Contents 5 Installation Mounting the DGPS 53 sss 6 7 Connecting DGPS 53 subsets 8 9 Operation Using th DGPS 93
36. th respect to each other When satellites are located in a line or a close group satellite geometry is considered poor This same requirement applies to DGPS If corrections are available for four different satellites but they are all located in the same general area or in a line the DGPS corrections will be minimal However if the same four satellites are placed farther apart in several very different directions from our position the corrections will have a much greater effect and the position accuracy will be greatly improved Problem 1 Beacon signal weak or not received 2 Accuracy not as expected 3 No output from DGPS 53 Reference Troubleshooting Chart Possible Cause Interference from ships electrical system thunderstorm activity or another source is inhibiting signal lock on Wrong frequency or bit rate selected Poor satellite geometry exists too few satellites are visible E uo nterference to GPS antenna and or beacon antenna exists ultipath signals being received by GPS unit Too far from DGPS transmitter or not tuned to closest station Unit not wired properly Check wiring Receiving device not properly configured 23 Reference DGPS 53 Specifications Complete information concerning NMEA amp RICM formats and sentences is available for purchase at National Marine Flectronics Association NMEA PO Box 3435 New Bern NC 28564 3435 USA 252
37. therlands Norway Portugal Spain etherlands Norway Spain Sweden DAJIKA BASE Republic of Maldives and TAIN 1936 England Isle of Man 25 Appendix A Earth Datums 33 GUAM 1963 Guam Island 34 GUX 1 ASTRO Guadalcanal Island 35 HJORSEY 1955 Iceland 36 HONG KONG 1963 Hong Kong 37 INDIAN Bangladesh India Nepal 38 INDIAN Thailand Vietnam 39 IRELAND 1965 Ireland 40 ISTS O73 ASTRO 1969 Diego Garcia 41 JOHNSTON ISLAND 1961 Johnston Island 42 KANDAWALA Sri Lanka 43 KERGUELEN ISLAND Kerguelen Island 44 KERTAU 1948 West Malaysia Singapore 45 LC 5 ASTRO Cayman Brac Island 46 LIBERIA 1964 Liberia 41 LUZON Mindanao Island 48 LUZON Phillippines excluding Mindanao Island 49 MAHE 1971 Mahe Island 50 MARCO ASTRO Salvage Islands 51 MASSAWA Eritrea Ethiopia 52 MERCHICH Morocco 53 MIDWAY ASTRO 1961 Midway Island 54 MINNA Nigeria 55 ORTH AMERICAN 1927 Alaska 56 NORTH AMERICAN 1927 Bahamas excluding San Salvador Island 57 ORTH AMERICAN 1927 Central America Belize Costa Rica El Salvador Guatemala Honduras Nicaragua 58 ORTH AMERICAN 1927 Canal Zone 59 NORTH AMERICAN 1927 Canada including Newfoundland Island 60 ORTH AMERICAN 1927 Caribbean Barbados Caicos Islands Cuba Dominican Republic Grand Cayman Jamaica Leeward Islands Turks Islands 61 ORTH AMERICAN 1927 Mean Value CONUS
38. to the DGPS 53 through the DGPS Beacon Station The DGPS 53 then uses the corrections to remove errors from its own measurements Satellites received by the DGPS 53 but not by the GPS receiver at the beacon transmitter site will not have corresponding corrections When four or more satellites received by the DGPS 53 have corresponding corrections the result is a highly accurate position reading The more satellites with corrections the more accurate the position The DGPS 53 receives RTCM SC 104 format signals from ground based DGPS Beacon Stations operating in the 283 5 kHz to 325 0 kHz frequency band and data rates of 25 50 100 or 200 bits per second These stations are typically operated by government agencies such as the U S Coast Guard Generally the closest DGPS station will provide the most accurate correction data Individual stations vary and the user may wish to verify the suitability of the signal for the intended application with the station operator The station power is normally set to provide a usable range somewhere near 300 km Other factors such as local interference lightning time of day and season and if the path to the station is over ground or water and antenna selection or installation affect the usable signal range Reference Sources of Error Using a DGPS Beacon Receiver with your existing GPS Receiver can provide substantial improvements in accuracy however there may be occasio
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