Lowrance electronic X-25 User's Manual
Contents
1. kI e keta ssccisnn seometonstences 15 DISPLAY CONTRAST me 16 ASP Advanced Signal Processing 16 TRANSDUCERS AND ANGLES asas 17 SIGNAL INTERPRETATION FISHARCHE S 19 WATER TEMPERATURE AND THERMOCLINES 20 SURVEYING A LAKE illa ink ma gu Kan 22 BAIT issa 22 SONAR TROUBLESHOOTING 23 Copyright 1990 Lowrance Electronics Inc All rights reserved All features and specifications subject to change without notice All screens in this manual are simulated 4 The boat mustbe moving at aslow trolling speed tosee fish arches If the boat is motionless fish stay in the cone showing on the display as straight horizontal lines ELECTRICAL NOISE A major cause of sonar problems is electrical noise This usually appears on the sonars display as random patterns of dots or lines in severe cases it can completely cover the screen with black dots or cause the unit operate erraticly or not at all To eliminate or minimize the effects of electrical noise first try to determine the cause With the boat at rest in the water the first thing you should do is turn all electrical equipment on the boat off Make2. The unit is now in the manual mode Wait a few seconds and the menu will scroll off the screen s left side Pressing the ON CLEAR key also clears it To turn the automatic feature on again repeat the above steps except this time press the up arrow key RANGE You can t adjust the range when the X 25 is in the automatic mode It is adjustable when the unit is in the manual made however To do so first put the unit in the manual mode Now press the ON CLEAR kev to clear the screen Then press the menu key until the RANGE SEL menu appears as shown The current range shows at the bottom of the menu In this case the range is 60 feet Now press the up arrow key to decrease the range the down arrow key increases the range After you select the desired range press the When the Fish I D mode is off the depth of the water will affect the size and shape of the fish arch due to the cone angle diameter For example if the cone passes over a fish in shallow water the signal displayed on the X 25 may not arch at all This is due to the narrow cone diameter and the resolution limitations of the display 6 9 Both 8 degree and 20 degree transducers give accurate bottom read ings even though the bottom signal is much wider on the 20 degree model This is because you are seeing more of the bottom Remem ber the shallow edge of the signal shows you the true depth The rest of the signal tells you whether you are over rocks
3. mud etc SIGNAL INTERPRETATION Your X 25 gives an accurate picture of the bottom that your boat is passing A bottom of firm sand gravel shell or hard clay returns a fairly wide signal If the automatic mode is off and the signal narrows down then it means that you have moved over a mud bottom Mud absorbs the sound wave and retums a weak signal Turn up the sensitivity to see a better bottom signal Big rocks or stumps on a smooth bottom send back signals above the bottom level signal The height of the signal depends on the tar et s height As you pass over a post it should be clearly visible as a short line extending above the bottom signal A steep slope returns a wide signal the steeper the wider Signals retumed from a high underwater cliff are usually the widest of all ON CLEAR key to clear the display If you wait a few seconds it will automatically clear ZOOM The zoom feature enlarges all echoes on the screen Ifthe unit is in the automatic mode it tracks the bottom signal always keeping it near the bottom of the screen This lets you see small detail at the same time enlarging all echoes that appear on the screen The unit doesn t track the bottom in the manual mode and the adjustments are slightly different Zoom Automatic Operation To zoom the display first press the MENU key until the RANGE ZOOM menu appears Now press the down arrow key This switches the unit into the zoom mode A new menu im
4. side can be used if necessary Do not mount the speed sensor behind strakes ribs or thru hull fittings These will disturb the flow of water to the speed sensor In a typical installation the speed sensor is mounted six to twelve inches from the centerline of the hull The sensor must always be in the water to function properly Make certain the chosen location is in the water even at high speed or when the boat is on plane Once you determine the proper location place the sensor on the transom Make certain the sensor s bottom is flush with the bottom of the hull Mark the transom in four places two in each slot Drilla 5 32 mounting hole at each location Mount the sensor to the hull with four 10 stainless steel screws not included Use a good grade of caulking compound to seal the screws Adjust the sensor so it is flush with the bottom of the hull and tighten the screws If the base of the transom has a radius fill the gap between the transom and the sensor with caulking compound This will help insure a smooth water flow Route the sensor cable to the in line connector on the X 25 s power cable The speed temp sensor is now ready for use KEVBOARD BASICS The unit sounds a tone when you press any key This tells you the unit has accepted a command ON CLEAR Use this key to turn the unit on It also clears menu selections and the a ZAR menus from the screen aa 83 OFF 78 This key turn
5. you move into shallower water a bottom signal should appear 4 Check the battery voltage If the voltage drops the unit s transmitter power also drops reducing its ability to find the bottom or targets Bottom echo disappears at high speeds or erratic digital reading or weak bottom echo while boat is moving i The transducer may be in turbulent water It must be mounted in a smooth flow of water in order forthe sonar to work at all boat speeds Air bubbles in the water disrupt the sonar signals interfering with its ability to find the bottom or other targets The technical term for this is Cavitation 2 Electrical noise from the boat s motor can interfere with the sonar This causes the sonar to automatically increase its Discrimination or noise rejection feature This can cause the unit to eliminate weaker signals such as fish or even structure from the display Try using resistor spark plugs or routing the sonar unit s power and transducer cables away from other electrical wiring on the boat No fish arches when the Fish ID feature is off 1 Make certain the transducer is pointing straight down This is the most common problem if a partial arch is displayed See the Fish Arch section in your owner s manual for more information 2 The sensitivity may not be high enough In order for the unit to display a fish arch it has to be able to receive the fish s echo from the time it enters the cone until itleaves If the sen
6. certain the engine is off also Turn your X 25 on then turn off ASP Advanced Signal Processing There should be a steady bottom signal on the display Now turn on each piece of electrical equipment on the boat and view the effect on the sonar s display For example turn on the bilge pump and view the sonardisplav for noise If no noise is present turn the pump off then turn on the VHF radio and transmit Keep doing this until all electrical equipment has been turned on their effect on the sonar display noted then turned off If you find noise interference from an electrical instrument trolling motor pump or radio try to isolate the problem You can usually re route the sonar unit s power cable and transducer cable away from the wiring that is causing the interference VHF radio antenna cables radiate noise when transmitting so be certain to keep the sonar s wires away fromit You may need to route the sonar unit s power cable directly to the battery to Isolate it from other wiring on the boat tf no noise displays on the sonar unit from electrical equipment then make certain everything except the sonar unit is turned off then start the engine Increase the RPM with the gearshift in neutral If noise appears on the display the problem could be one of three things spark plugs alternator or tachometer wiring Try using resistor spark plugs alternator filters or routing the sonar unit s power cable away from engine wiring Again
7. damage will occur if the power wires are reversed However the unit will not work until the wires are attached correctly TO SPEED TEMP SENSOR 12 VOLT BATTERY IMPORTANT SERVICE INFORMATION if your unit is not working or if you need technical help please use the following troubleshooting section before contacting a service center or the factory cus tomerservice department It mav save you the trouble of returning yourunit See the How To Obtain Service section on page 26 if you need service SONAR TROUBLESHOOTING Unit won t turn on 1 Check the power cable s connection at the unit Also check the wiring 2 Make certain the power cable is wired properly The red wire connects to the positive battery terminal black to negative or ground 3 Check the fuse 4 Measure the battery voltage at the unit s power connector It should be at least 11 volts if it isn t the wiring to the unit is defective the battery terminals or wiring on the terminals are corroded or the battery needs charging Unit freezes locks up or operates erratically 1 Electrical noise from the boat s motor trolling motor or an accessory may be interfering with the sonar unit Re routing the power and transducer cables away from other electrical wiring on the boat may help Route the sonar unit s power cable directly to the battery instead of through a fuse block or ignition switch 2 Inspect the transducer cable for breaks cuts or pi
8. the unit s functions and features The menu key accesses these features allowing you to customize the unit to your particular needs and water conditions All you have to do to leave one menu and enter another is press the menu key repeatedly If you ever get lost in the menus simply press the ON CLEAR key This clears the menus from the screen Menus change depending on the mode the unit is in For example if FISH ARCHES the automatic mode is turned off the sensitivity menu changes from AUTO SENS to MAN SENS Other messages may appear in i when ne of sound passes over a fish menu boxes or new menus appear again depending on previous Fish arches are created when the p The distance to a fish when the cone first strikes it is shown as A selections below When the center of the cone strikes the fish the distance is shorter as shown B As the cone leaves the fish the distance OPERATION increases again as shown in AUTOMATIC BOATS DIRECTION OF TRAVEL H a When the X 25 is first turned on the auto matic feature is enabled This feature automatically adjusts the unit s range and sensitivity according to water conditions It always keeps the bottom depth displayed in the lower portion of the screen To turn the automatic feature off press the menu key until the AUTO MAN menu appears Now press the down arrow key This highlights the letters MAN
9. up or down in one foot increments by pressing the arrow keys Thus you can move the zoom window up towards the surface down to the bottom or anywhere in between The window stays where you put it It doesn t track the bottom signal zM 20 34 4FT To turn the zoom feature off press the menu key until the RANGE ZOOM menu appears Now press the up arrow key This switches the unit into the range mode which turns the zoom feature off TRANSDUCER CONE ANGLES The sound waves from the transducer spread out into the water in a cone shaped beam This looks much like the beam from a flashlight The angle between the outside edges of the cone is the cone angle Lowrance offers a choice of transducers with either an 8 or 20 degree cone angle The transducer supplied with the X 25 has a 20 degree cone angle Typically wide cone angle transducers 20 degrees are ideal for operating in shallow to medium water depths The 20 degree cone angle allows you to see more of the underwater world 1n 15 feet of water the 20 degree cone covers an area about six feet across The 8 degree transducer covers only about a two foot circle The 20 degree transducer is almost always the best to use in fresh water the 8 degree mostly in salt water In a deep water environ ment 300 feet fresh water 100 feet salt water the narrow cone angle is more desirable Since the sound energy is concentrated in a smaller area it can penetrate to much d
10. water Large fish will arch but turn the sensitivity up in deeper water to see the arch Because of water conditions such as heavy surface Clutter thermoclines etc the sensitivity sometimes cannot be in creased enough to get fish arches One of the best ways to get fish arches is to expand or zoom a segment of the water For example from 45 to 60 feet The smaller the segment the better the screen resolution will be The easiest way to do this on the X 25 is with the Zoom feature This feature expands the echoes making it easier to see detail For the best results turn the sensitivity up as high as possible without getting too much noise on the screen In medium to deep water this method should work to display fish arches If you see fish signals when the unit is in the manual mode but don t get fish symbols when the Fish 1 0 feature is on try increasing the sensitivity WATER TEMPERATURE AND THERMOCLINES Water temperature has an important if not controlling influence upon the activities of all fish Fish are cold blooded and their bodies are always the temperature of the surrounding water During the winter colder water slows down their metabolism At this time they need about a fourth as much food as they consume in the summer Most fish don t spawn unless the water temperature is within rather narrow limits The surface temperature meter built into the X 25 helps identify the desired surface water spawning tempera
11. when the X 25 is first turned on It has the following features 1 Automatic On 2 Fish ID Feature On 3 Digital Depth Display On CHT 2 Chart 2 Same as Chart 1 plus digital surface water temperature display Requires optional LST T Speed Temp Sensor CHT 3 Chart 3 Same as Chart 1 plus digital speed display Requires optional LST T Speed Temp Sensor 12 CHT 4 Chart 4 This is the High Speed Scroll mode It shifts the chart speed into high gear scrolling echoes at a high rate It has the following features 1 Automatic Off 2 Fish ID Feature Off 3 All Digital Displays Off DEPTH FT 60 8 DIG 1 Digital 1 This is the first digital only screen It shows the digital depth display at the top of the screen in very large numbers The shallow and deep alarm settings are displayed beneath the digital depth No chart shows on this screen peep DEPTH FT 3 8 3 DIG 2 Digital 2 ME oF The digital depth display shows at the top 5 of this screen very large digits The digital temperature speed and log shows era beneath the depth Requires optional LST T Speed Temp Sensor Thelog starts counting when the X 25 is first turned on The log is reset to zero when the X 25 is turned off 13
12. LITHO IN U S A 988 0105 33 X 25 INSTALLATION AND OPERATION INSTRUCTIONS LOWRANCE ELECTRONICS INC 12000 E SKELLY DR TULSA OK 74128 NOTES NOTES 9 TABLE OF CONTENTS INTRODUCTION o oo aieeaa a aa E aa e aa raaa E Eat 1 INSTALLATION seca od POWER CONNECTIONS ce cescscscscsssseseeesesenenenenenensesesesesesesaesetsceseseneseeeseeeseenenes 2 SPEED TERMPERATURE SENSOR sesrsnnneznznnnnneneznznnnnn snnannnanennnnnnnnenennntznznt 3 KEYBOARD BASICS i i ii gera kamin nse 4 DISPLAY a 5 MENU E aa ie 5 OPERATION is isir sie i AS ia a A e 6 AUTOMATIC i ra 6 RANGE 1 a T 6 ZOOM Automatic Operation 7 ZOOM Manual Operation ss sensenennnnznnznnenznnnntr tren na nanrtrntnmnamtn 8 SENSITIVIT 9 G ANLINE RE E 9 FISH ID iii a a T in akasitai suscacotssbeccnsabusaconavs 10 GHART SPEED 2 a a Eva ata ag aa ka Gas SG 11 DISPLAY MODE 22222 e o aa ri 12 ALARMS aa es ea ea a a 14 FISH ALARM 14 DEPTH ALARMS 14 JA l a T AE 15 FEE T METER
13. MAN SENS Now press the up arrow key to increase the sensitivity the down arrow to decrease it A vertical bar graph in the menu box shows the sensitivity level Echoes scrolling onto the screen wilt also show the effects of the sensitivity change If you reach the maximum or minimum sensitivity level a tone sounds alerting you to the limits After you ve adjusted the unit to the desired sensitivity level press the ON CLEAR key to clear the display If you wait a few seconds it will automatically clear GRAYLINE GRAYLINE lets you distinguish between strong and weak echoes It paints gray on targets that are stronger than a preset level This shows the difference between a hard or soft bottom large fish versus smaller ones or rocks and brush on the bottom For example a soft muddy or weedy bottom retums a weaker signal which shows a 9 narrow or no gray line A hard bottom returns a strong signal that causes a wide gray line If you have two targets of equal size one with gray and the other without the target with gray is the stronger echo This helps distin guish fish from structure or the larger fish from a smaller one GRAYLINE is adjustable Since it shows the difference between strong and weak echoes changing the level may require a different sensitivity setting To change the GRAYLINE level first press the MENU key until the GRAYLINE menu appears Now press the up arrow key to increase the
14. appears Then press the up arrow key until the word OFF appears The alarm is now off Deep Alarm The deep alarm adjusts the same as the shallow alarm Use the DEEP ALARM menu to adjust the deep alarm When the bottom signal goes deeper than the setting an alarm tone sounds LAMP The X 25 s display is backlighted for night use To turn the backlights on or off press the menu key repeatedly until the LAMP menu appears Now press the up arrow to turn the lights on or the down arrow to turn them off The menu will clear automati cally after a few seconds or you can press the ON CLEAR key to clear the screen FEET METER The X 25 can show the depth in feet or meters When the unit is in the metric mode all depth readings ranges zooms and alam settings are in meters Speed displays in knots and log is in nautical miles Temperature is in degrees Celsius When it s in the feet mode all of the above seitings are in feet miles per hour and statute miles Temperature shows in degrees Fahrenheit 15 ALARMS FISH ALARM The Fish Alarm sounds a tone when a fish svmbol appears on the screen To use the fish alarm press the menu key until the FISH ALARM menu appears on the screen Now press the up arrow key to turn the alarm on Repeat the above steps to turn the fish alarm off Note If the Fish ID feature is off it will be turned on when you turn the fish alarm on DEPTH ALARMS The depth alarm
15. ce of plywood on the back side of thin panels to reinforce the panel Make certain there is enough room behind the unit to attach the power and transducer cables 5 7 8 73 4 Drill a hole in the dash for the power and transducer cables The best location for this hole is immediately under the gimbal bracket This way the bracket covers the hole The smallest hole both the power and transducer cables can pass through is one inch However you can t pass a power or transducer connector and another cable through aone inch hole Therefore after drilling the hole pass the transducer connector up through the hole from under the dash Then drop the power cable down from the front side of the dash Slide the bracket over the hole then route the transducer and power cables out the slots in the bracket Finally fasten the bracket to the dash POWER CONNECTIONS The X 25 works from a 12 volt DC system only For the best results run the power cable directly to the boat s battery Keep the power cable away from other boat wiring especially the engine s wires This will give the best isolation from electrical noise If the supplied cable is not long enough to reach the battery splice 18 gauge insulated wire to it You can attach the power cable to an accessory or power buss however you may have problems with electrical interference See page 25 for more information on electrical noise This unit has reverse polarity protection No
16. eeper depths 50 100 150 17 To change from feet to meters or vice versa press the menu key until the FEET METER menu appears Press the down arrow key to switch to metric the up arrow to switch to feet Displays show in feet when the unit is first turned on The menu will clear automatically after a few seconds or press the ON CLEAR key to clear the Screen DISPLAY CONTRAST The unit s display contrast is adjustable to suit different lighting conditions This will help you see the screen from different angles or at various times of the day To adjust the contrast press the menu key until the DARK LIGHT menu appears To decrease it press the down arrow key Press the up arrow key to increase the contrast The bar graph in the Dark Light menu box shows a graph of the contrast The screen will also show the effects of the change If you reach the maximum or minimum level a tone sounds alerting you to the limits The menu will clear automatically after a few seconds or you can press the ON CLEAR key to clear the screen ASP Advanced Signal Processing ASP is a program embedded in the X 25 s computer that is specifically designed to eliminate noise It continually monitors the signals from the receiver determines which echoes are noise and rejects them This allows true target echoes to display on the screen with a minimum of clutter This feature is especially useful since it typically lets you operate the boat a
17. level the down arrow to decrease it The bar graph in the GRAY LINE menu box shows the level now in use Echoes scrolling onto the screen will also show the effects of the GRAYLINE change If you reach the maximum or minimum level a tone sounds alerting you to the limits The level chosen by the X 25 when it s first turned on is usually adequate for most conditions Experiment with your unit to find the GRAYLINE setting that s best FISH ID FEATURE The Fish ID feature identifies targets that meet certain conditions as fish The micro computer analyses all echoes and eliminates surface clutter thermoclines and other undesirable signals In most in stances remaining targets are fish The Fish ID feature displays symbols on the screen in place of the actual fish echoes There are four symbol sizes tiny small medium and large These show the relative size between targets In other words it displays a small fish symbol when it thinks a target is a small fish a medium fish symbol on a larger target etc The micro computer is sophisticated but it can be fooled It can t distinguish between fish and other suspended objects such as turtles submerged floats air bubbles etc Individual tree limbs extending outwards from a group of limbs are the hardest objects for the Fish ID 10 turn the alarm sound off until the shallow alarm is triggered again To turn the alarm off press the menu key until the shallow alarm menu
18. mediately appears as shown on the right This is the zoom size menu Zoom size is the distance between the upper limit and the lower limit The upper limit shows at the top left corner of the screen The Jower limit is in the bottom left corner For example if the upper limit is 40 feet and the lower limit is 70 feet the zoom window size is 30 feet The word TRACK appears in this menu when you first activate the zoom This means the X 25 is track ing the bottom in a zoom window always keeping it on the display Press the up arrow key to decrease the zoom size press the down arrow key to increase the zoom size When the unit is switched into the zoom mode the letters ZM appear at the top of the screen The zoom window size displays in the top right corner of the screen To turn the zoom feature off press the menu key until the RANGE ZOOM menu appears Now press the up arrow key This switches the unit into the range mode which turns the zoom feature off Zoom Manual Operation To operate the zoom feature when the X 25 is in the manual mode first press the menu key Then press the down arrow key in the RANGE ZOOM menu to place the X 25 in the zoom mode The zoom size menu automatically appears next You can change the zoom size by pressing the up or down arrows After you select the desired zoom size press the menu key until the MOVE ZOOM menu appears This menu lets you move the zoom window
19. nched wires 3 Check both the transducer and power connectors Make certain both are securely plugged in to the unit Weak bottom echo digital readings erratic or no fish signals 1 Make certain transducer is pointing straight down Clean the face of the transducer dirt and fuel can cause a filmto form onthe transducer reducing its effectiveness the transducer is mounted inside the hull be sure it is shooting through only one layer of fiberglass and that it is securely bondedto the hull Do NOT use RTV silicone rubber adhesive or Marinetexu 22 SURVEYING A LAKE The most successful anglers on any body of water are those who fish it day after day and year after year Eventually they leam the hot spots that produce fish consistently They discover through experi ence where and at what depth they can expect to find the fish they want at any season And they realize that these productive areas change throughout the year depending on water level temperature food and other factors With the X 25 anyone can eliminate guesswork and concentrate on the areas where fish are likely to be Even if it s the first time on the lake The most efficient way to become acquainted with a body of water is to survey it with your X 25 Start with a map of the lake if possible and indicate the promising spots in relation to landmarks on shore As you go about your survey your X 25 will tell you the depth and type of bottom It
20. routing the power cable directly to the battery helps eliminate noise problems Make certain to use the in line fuse supplied with the unit when wiring the power cable to the battery When no noise appears on the sonar unit after all of the above tests then the noise source is probably cavitation Many novices or persons with limited experience make hasty sonar installations which function perfectly in shallow water or when the boatis atrest In nearly allcases the cause ofthe malfunction will be the location and or angle of the transducer The face of the transducer must be placed in a location that has a smooth flow of water at all boat speeds Read your transducer owner s manual for the best mounting position Weak bottom echo digital readings erratic or no flsh signals cont 2 Electrical noise fromthe boat s motorcan interfere with the sonar This causes the sonar to automatically increase its Discrimination or noise rejection feature This can cause the unit to eliminate weakersignals such as fish or even structure from the display 3 The water may be deeper than the sonar s ability to find the bottom If the sonar can t find the bottom signal while it s in the automatic mode the digital will flash continuously It may change the range to limits far greater than the water you are in ff this happens place the unit in the manual mode then change the range to a realistic one for example 0 100 feet and increase the sensitivity As
21. s are triggered only by the bottom signal No other echoes will activate these alarms The depth alarms consist of a shallow and deep alarm The shallow alarm sounds an alarm tone when the bottom goes shallower than the alarm s setting The deep alarm sounds a tone when the bottom goes deeper than it s setting Both alarms adjust the same although through different menus Shallow Alarm To set the shallow alarm press the menu key repeatedly until the SHAL ALARM menu appears Press the down arrow key to increase the depth the up arrow key decreases it The number in the shallow alarm s menu box shows the current shallow alarm setting When the number reaches the desired setting release the arrow key Press the ON CLEAR key to remove the shallow alarm menu from the screen Now when the bottom depth goes shallower than the alarm s setting an alarmtone sounds At the same time the alarm sounds a message box appears on the screen as shown at left Press the up arrow key to silence the alarm This will 14 feature to distinguish from fish You may see Fish ID symbols on the screen when in fact there are no fish Practice with the unit when the Fish ID feature is on and off to become more familiar with Fish ID When the X 25 is first turned on the Fish ID feature is automatically turned on also To turn this feature off press the menu key until the Fish D feature s menu appears as shown below Now pres
22. s the down arrow key This turns the feature off To turn it back on repeat the above steps but press the up arrow key instead The Fish ID feature can t be used when the X 25 is inthe manual mode If you turn the automatic feature off the Fish ID feature will automatically be turned off also CHART SPEED The rate echoes scroll across the screen is called the chart speed It s adjustable by pressing the menu key until the chart Speed menu appears Chart speed is set to maximum when the X 25 is first turned on To de crease it press the down arrow key Press the up arrow key to increase the speed again The bar graph in the Chart Speed menu box shows a graph of the speed Echoes scrolling onto the screen will also show the effects of the change If you reach the maximum or minimum level an warming tone sounds To stop the chart first clear any menu from the screen by pressing the ON CLEAR key You can t stop the chart while a menu is displayed Now press the up arrow key The chart will freeze and the word STOP appears at the top right portion of the screen To start the chart press the up arrow key again DISPLAV MODE The X 25 has six different screen modes To change modes press the MENU key until the DISP MODE Display Mode menu appears Then press the up or down arrow keys until the desired mode number appears The modes are as follows CHT 1 Chart 1 This is the default mode used
23. s the unit off SURFACE LAYER ABSORBS HEAT FROM THE SUN l EPILIMNION MENU 77 The X 25 has many menus of features that are accessed with this key UP and DOWN ARROWS Use these keys to adjust virtually every feature and function on the unit Use these keys to adjust the sensitivity chart speed range and more 76 75 THERMOCLINE MOST PRODUCTIVE ZONE FOR FISHING 56 VARIES IN DEPTH DUE TO WIND 50 47 The temperature of water in the lake is seldom constant from top to bottom Layers of different temperatures form and the junction of a warm and cool layer of water is called a thermocline The depth and NOTE The up arrow key also stops and starts the chart when no Thermoclines are important to fis iiaae they are areas menus are displayed In other words anytime you wish to stop the where fish are active Many times above the chart first make certain no menu is on the screen Then press the up thermocline while larger game fish will suspend in or just below it arrow key The chart will freeze and the word STOP appears at the top right portion of the screen To start the chart press the up arrow The X 25 can detect this invisible layer in the water but the sensitivity key again will probably have to be turned up to see it 4 24 Very small fish probably will not arch at all Medium sized fish will show a Partial arch a shape similar to an arch if they re in deep
24. sitivity is not high enough the unit displays the fish only when it is in the center of the cone 3 Use the Zoom feature It is much easier to display fish arches when zoomed in on a small range of water than a large one For example you will have much better luck seeing fish arches with a 30 to 60 foot range than a 0 to 60 foot range This enlarges the targets allowing the display to show much more detail INTRODUCTION Thank you for purchasing a Lowrance sonar Your X 25 is a high quality sonar designed for both professional and novice fishermen These units have an automatic feature that finds and displays the bottom fish structure and more All you have to do is press the on key However if you wish to fine tune the unit all you have to do is press the menu key The X 25 has powertul features available through easy to use menus To get started with your unit first read the installation section This is where it all begins Improper installation can cause problems down the road After you ve read the instructions install the unit then read the rest of the manual The more you know about your unit the better it will perform for you Take this manual for reference when you head for the water INSTALLATION Mount the X 25 in any convenient location provided there is clearance when it s tilted for the best viewing angle Holes in the bracket s base allow wood screw or through bolt mounting It may be necessary to place a pie
25. t all speeds without adjusting the sensitivity or other controls When the X 25 is first turned on ASP is enabled To tum ASP off press the menu key repeatedly until the ASP menu appears Now press the up arrow to turn it on or the down arrow to tum it off The menu will clear automatically after a few seconds or you can press the ON CLEAR key to clear the screen 16 SENSITIVITY The sensitivity menu lets you control the unit s ability to pick up ech oes A low sensitivity level excludes much of the bottom information fish signals and other detail High sensitivity settings lets you see features but it can also clutter the screen with noise and other un wanted signals Typically the best sensitivity level shows a good solid bottom signal with grayline The X 25 adjusts the sensitivity level to keep a solid bottom signal on the screen It adds a little extra when it s in the automatic mode This gives it the capability to show fish and other detail However situ ations occur where it becomes necessary to increase or decrease the sensitivity level Typically this occurs when you wish to see more detail so you need to increase the sensitivity The procedure to adjust it is the same whether the unit is in the automatic or manual mode To change the sensitivity level first press the menu key until the sensitivity menu appears If the unit is in automatic the menu shows AUTO SENS Otherwise the menu shows
26. tures for various species Trout can t survive in streams that get too warm Bass and other fish eventually die out when stocked lakes that remain too cold during the summer While some fish have a wider temperature tolerance than others each has a certain range within which it tries to Stay Schooling fish suspended over deep water lie at the level that provides this temperature We assume they are the most comfortable here 2 DISPLAY General The lights flash for about ten seconds when the X 25 is turned on Three menus appear one after the other The menus are the lights LAMP feet meter selection FEET METER and contrast adjustment DARK LIGHT To turn the lights on press the up arrow key To switch from feet to meters press the down arrow key when the proper menu appears To adjust the contrast wait for the DARK LIGHT menu to appear Now press the up arrow key to darken the screen the down arrow to lighten it The menus disappear after a few sec onds If you don t want to wait press the ON CLEAR key to clear the menus from the screen When the X 25 is first turned on the display appears similar to the one below The unit is in the automatic mode and the Fish D feature is on The depth range displays on the left side of the screen In this ex ample the range is from 0 to 60 feet The digital bottom depth display shows at the top left portion of the screen MENUS The X 25 uses menus to guide you through
27. will also reveal suspended fish Keep a few marker buoys in the boat ready to toss overboard When the X 25 indicates a school of fish throw the buoy out With the school thus marked you can make your turn and come back to fish in exactly the right spot This is essential when you re far from shore on a big lake Unless you mark the school of fish when you re over it you may not be able to find it again BAIT FISH The importance of bait fish to successful fishing can t be over empha sized They are the principle food of all game fish in most waters Bait fish are the plankton feeding forage fish such as minnows and shad Bait fish can also be the young of game fish such as crappies bluegill and bass Most bait fish concentrate within five feet of the surface where sunlight promotes the growth of the plankton on which they feed One method of fishing is to use the X 25 to find the bait fish first With the Fish ID feature off a school of bait fish will look like a cloud on the display Usually game fish will be nearby often directly beneath the school of bait fish 22 SPEED TEMPERATURE SENSOR INSTALLATION Requires OPTIONAL LST T Speed Temp Sensor Mount the speed temp sensor on the boat s transom a location where the flow of water is the smoothest There should be a minimum of turbulence and air bubbles in the chosen location The port left side of the transom is preferred however the starboard right
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