User manual LOWRANCE X-50

INSTALLATION AND OPERATION MANUAL X-50 Cl LCG RECORDER · LOWRANCE ELECTRONICS, INC. LITHO IN USA. 988-0105-11 Rev.A 12000 E.SKELLY DR.,TULSA, OKLA. 74128 PDF compression, OCR, web-optimization with CVISION's PdfCompressor NOTES ©Copyright1987Lowrance Electronics, Inc.All Rights Reserved. PDF compression, OCR, web-optimization with CVISION's PdfCompressor 45 TABLE OF CONTENTS NOTES Installation Power Connections Temperature SensorInstallation Noise Keyboard Basics Operation On . 2 2 4 5 6 8 8 8 8 9 9 9 10 10 11 Off 2nd Clear Auto Sensitivity Sensitivity--Automatic Sensitivity--Manual GRAYLINE ChartSpeed Scale Markers Range LowerLimit--Automatic LowerLimit--Manual UpperLimit Auto Range with ZoomBottom Track Digital 10th Alarms Zone Alarm Clearing Zone Alarm NoteKey Depth Alarm Light Discirmination Temperature Surface ClatityControl (SCC) Speed Log Feet, Fathoms, Meters Pulse Preset Display Memory Command Key--MENUS FASTRAK Orayline Checkerboard/Lines Speaker Volume Clear Distance Log Narrow/WideAuto Range Window Digital Averaging Battery Backup Scale On/Off Calibrate Speed Test Pattern Keel Offset Total System Reset Transducers and Cone Angles Signal Interpretation Fish Signals WaterTemperature andThermoclines Surveying a Lake Bait Fish How to Obtain a Schematic Specifications 12 13 14 14 15 15 16 17 19 19 20 21 21 21 23 23 24 25 26 27 27 28 28 29 30 31 32 33 33 33 34 35 36 36 37 38 39 40 40 41 41 32 32 32 as PDF compression, OCR, web-optimization with CVISION's PdfCompressor 44 1 The Lowrance X-50 Liquid Crystal Sonar (LCG) is the most sophisticated and reliable instrument of its kind. Its high resolution display gives the sharpest definition ever. Thisunit is so advanced,you can just press the "ON" button and let it do all the work. However, taking manual control enables you to open up a whole world of features not available in other sonars. To get started with your X-50, firstreadthe installation section.This is where it all begins, and improper installation can cause problems down the road. After you've read these instructionsand installedyourX-50, read the reSt of this manual in detail. The more you know when you get to the water, the more your X-50will do foryou. NOTES INSTALLATION TheX-50 can be installed in any convenient location, provided there is clearance when tilted for the best viewing angle. Roles in the bracket base allow wood screw or through bolt mounting. The bracket can be attached to aluminum panels with sheet metal screws. However, we suggest placing a piece of plywood on the back of thin fiberglass panels to secure themounting hardware. Make certain there is enough room behind the unit to attach the power and transducer cables. A one inch hole in the base of the gimbal bracket allows the power and transducer cables to be routed up through the mountingsurface.After the cables have been routed, the hole can be filled with silicone rubber adhesive (RTV) to prevent water leaks. Mounting Power Connections TheX-50 operatesfroma 12voltbatterysystem. Thepower cablecan be attached to an accessory or powerbuss,but ifyouhave problems with electrical interference (random dots or lines that show whenever the boat's engine or an accessory is on), then attach the cable directly to the battery The power cable hastwo sets of cables.One set has the red power and black ground wires for connection to the 12 volt battery system. The other hasa connector for the temperatureprobe and the optional speed sensor.See the owner's manualenclosed with the LSS-5 speed sensorfor installation instructions. PDF compression, OCR, web-optimization with CVISION's PdfCompressor 2 43 NOTES Thepower cable has two wires, red is the positive lead and black is negative or ground. An in-line fuse holder containing a 4 amp fuse is supplied with the X-50c This attaches to the red wire on the power cable with the crimp connector.The other end of the fuse holder attaches to the battery or accessory buss. if the cable is not long enough, splice ordinary #18 gauge wire onto Be certain that the fuse holder is as close to the power source (batteryor accessory buss) as possible. This protects the power cable and your X-50 in the event of a short. TheX-50 is protected from accidental polarity reversals and will not be harmed if the wires are reversed. (However, the unit will not work until the correct polarity is it applied.) F0v18r Cabk SpUta Figure 1 Terrpersar 3 PDF compression, 42 OCR, web-optimization with CVISION's PdfCompressor The temperature sensor should be mountedin a location that allows contactwiththe waterat all times.Thediagram in Figure2 shows a typical location. Once a suitable place is found, mountthe sensor to the hull with two #8 stainless steel screws.Above the water line drill a ¾" hole for the connector to passthrough. Route the cable via the shortest path to the X-50's power cable. Plug the sensor's cable into the in-lineconnector on the X-50's power cable. NOTE:If the speed sensor is also installed, plug the temperature sensor into the speed sensor's in-line connector, then attach the speed sensor's plug to the in-line connector on the X-50's power cable. See figure 3 for details. Figure 2 TEMPERATURE SENSOR TEMPERATURE SENSOR INSTALLATION -Povier Cabt SPECIFICATIONS Figure 3 Dimensions 7"Hx8.8"Wx3.7"D 2.6 pounds 192 kHz Weight Transmitter OutputPower (typical) ReceiverSensitivity OperatingCurrent OperatingVoltage Number of Pixels 3000 watts (peakto peak) 375 watts (RMS) 500 ma 9-15 vdc 192 vertical 64 horizontal 12,288total Sersor Speed PDF compression, OCR, web-optimization with CVISION's PdfCompressor 4 41 The temperatureof water in the lake is seldom constant from top to bottom. Layersof different temperaturesform, and the junction of a warm and cool layer ofwater is called a thermocline.Thedepth and thickness of the thermocline can vary with the season or time of day. In deep lakes theremay be two or more at differentdepths.Thermoclinesare important to fishermen because theyare areas where fish are acti ye. Many times baitfish will be abovethe thermoclinewhile larger game fish will suspend in or just below it. TheX-50candetectthis invisible layerinthe water,butthe sensitivity will probably haveto be turned up to seeit A knowledge of the water temperaturesvarious fish prefer, and in which they usually remain, helps you get the most from your X-50. SURVEYING A LAKE TRANSDUCER Installationinstructions forthetransducer are supplied with the transducer in a separatepackage. Please read the instructions carefully before you start installingthe transducer. Themost successful anglers on any lake or reservoir are those who fish it dayafterdayand year after year until they learn the hot spots that producefish consistently. They discoverthrough experiencewhere, and at what depth, they can expect to find the kind of fish they want at any season.And they realize that these productive areas change throughout the year dependingon water level, temperature, food, and other factors. With the aid of the X-50, anyone can eliminateguesswork and concentrate on the areas where fish are likelyto be-even if its the firsttime on the lake! Themost efficentway to become aquaintedwith a body ofwateris to survey it with your X-50. Start out with a map of the lake, if possible, and indicate the promisingspots in relationto landmarkson shore. Keep a few Lowrance Fish-N-Floats in the boat, ready to toss overboard. When the X-50 indicates a school offish, throwthe buoy out. The string will unwind until the sinker hits boftom. Then, because of the marker's flat shape, it won't unwind any further. With the school thus marked,you can makeyour turn and come back to fish in exactly the right spot. This is essentialwhenyou're far from shore on abig lake.Unless you mark the school offish when you're over it, you may not be ableto find it again. Electrical noise picked up by the power cable can be minimized by routing it away from otherpossible sources of electrical interference.One of the largest noise generators is the engine's wiring hamess that runs from the engine to the instrument panel. This harness usually contains a wire for the tachometer which radiates SF (radio frequency) energy. For best results, keep thepower and transducer cables away fromthe engine wiring. Also, bilge pumpwiring can sometimesradiate noise so tryto keep the X-50's cables away fromthose wires. VHF radio antenna cables radiate SF energy at higher power levels than even the engine's wiring harness. It is very important to keep the X-50's power and transducer cables as far away as possible from VHF radio antenna cable. If there is no noise--interference--onthe unitwhenthe boat is sifting still with the enginerunning in neutral, but interferencebegins atslowboat speeds,worsening as the boat speed increases,then a probable cause is acoustic noise, or cavitation. This noise is not electrical, but rather mechanicallyinduced noise from thetransducer Usually, acoustic noise is created by air bubbles passing over the faceof the transducer.As a boat travels faster, more air bubbles are created which generate noise on the display.To eliminatethis problem, read the transducer owner's manualfor proper mountingtechniques. NOISE BAIT FISH emphasized. They arethe principle food of all game fish in most waters. The importance of bait fish to successful fishing can't be over- Bait fish are the planktonfeeding 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 are concentrated 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-50to find the baitfish first A school of baitfish will look likea "cloud" on the X-50's display.Usually, game fish will be nearby, often directly beneaththe school of bait fish. 40 PDF compression, OCR, web-optimization with CVISION's PdfCompressor 5 KEYBOARDBASICS SENSITIVITY These keys control thegraph's sensitivity. Thedigital's sensitivityisalways automaticallyadjusted, while the graph's senstivityis automatiCallyadjusted whenthe X-50 is inAutomatic.Thereceiver sensitivity has 31 steps which allows adjusbnentfora wide range ofconditions. The left arrowkeydecreases the sensitivity,the right arrowkey increases it. ET1 t.r:ysa stop RESUME ________________ FAST STORE SLOW LRECALL DIGITAL 10TH e]I?if.]fl:p fl4·I IsUl _______ __________ 1" ShALLOW SET SHALLOW ALARM ZONE ALARM This group of keys control theX-50's zone alarm. It can be used asa "fish alarm" that will sound iffish ora schooloffish enters The alarm zone. Thebottom signal will -- '" t 'tj;--' DISPLAY DEEP ALARM I _______ LPRESET DEEP SET I DIi1 tOOMMANDJ alsoset offthe alarm. _______ _______ _______ 1 2 TEMP °F/°C 5CC _______ _______ _______ SPEED If a partial arch occursmost ofthetimeon yourunit(the mark curves but not back down, or vice-versa) it could be the transducer is not pointed straightdown, If the transducer is mountedon the transom, adjust it until thefish show the distinctivearch. Thismaytakesometrial anderror until the correct mounling is achieved. Remember, there must be some movementbetweenthe boat and the fish to develop the arch. Usuallythis means trolling at very slow speeds with the main engine in gearat a minimum throttle setting. Thedepth of the water will affect the size and shape fish arch dueto the cone angle diameter. For example, if the cone passes over a fish in shallow water,the signal displayed on theX-50 may not arch at all, due to the narrow cone diameterand the resolution limitationsof the display. Compared to a paper graph, an X-50 cannot show as fine of detail because the pixels (dots on the screen) are much larger than a paper graph's markings.Therefore,theX-50 cannot showfish arches as well as graph, and it requires a bit more work initially to read and interpret the up, 4 7 01ST LOG BTM TRK 5 8 0.9 Thesekeys allow the-- entry of numbers 0through 9. SIZE 3 6 M/KT/I( 9 FT/FA/M someof these keys have more than cnefunction (printed in the display. white letters) and can be accessed using the 2nd key. When anumeric key is pressed, thenumber will bedisplayed in awindow near thetop center of UPPER LIMIT CAR erases thelastkey pressed.It can alsoerase other features, as will be seen later TheCAR keys L211t1 [0FFI[ ON] _______________ _______ _______ PULSE 0 LOWER LIMIT screen than a paper graph. Very small fish probably will not arch at all, while medium sized fish will show a partial arch, or a shape similar to an arch if they're in deep water. Large fish will arch, but the sensitivity needs to be turned up in deeper water to seethe arch. Because of water conditions,suchas heavy surface clutter, thermoclines, etc., the sensitivity sometimes cannot be turned high enoughto getfish arches. One of the best ways to get fish arches is to expand or "zoom" a segment of the water,for example40 to 60 feet Thesmaller the segment, the betterthe screen resolutionwill be. Then,turnup the sensitivity as high as possible withoutgeffing too much noise on the screen. In most water depths,this method should workto display fish arches. MADE IN U.S.A. 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 thetemperatureof thesurrounding water.During the winter,colder water slows down their metabolism so that they need about a fourth as much food as they consume in the summer Mostfish don't spawn unless the water temperatureis within rather narrow limits. To find the different temperatures, the X-50's surface temperature display is a valuable aid to your boat. This unit providesan extremelyquick responseto identifyingthe desired surfacewater spawntoo warm;bass and other fish eventuallydie outwhen stockedin lakesthat remain too cold duringthesummer.While some fish have awidertemperature 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 providesthis temperature inwhich,we assume, theyare the mostcomfortable. ing temperaturesforvarious species.Trout can't survive in streamsthat get Figure 4 OFF ON Thesekeystum theX-50offand on. Toturnit on, simplypress theON key.To turnitoff, press theOFF key.A beep will occureverytime akey ispressed.This istheX-50s weyoftefiyoj thatithasaccepted acommand. PDF compression, OCR, web-optimization with CVISION's PdfCompressor 6 FISH SIGNALS iOUs shaped markings in certain patterns,as opposed to random marks Created by noise, or the solid, continuousmarkings made by the bottom. The signals displayed on the X-50 by fish can be identified by var- Individualfish can, at times, be distinguishedby a characteristic arch thatseparatesthem from their stationarysurroundings.Thereason for this is shown below.Thedistance to afish when it movesinto the sonar's cone of sound is shown as "A" Figure 32. When the fish has moved intothe center of the cone, the distance to it will be shorter, "B", and as it moves out of the cone, the distance will increase again as shown in "C". I-- F 10TH IF$IlL'AIl' GRAYLINE SET TOP RECALL .._-- GRAYLINESET Pressingthis key allows you to adjust the grayline level using thesenstivity keys.There are31 steps ot GRAYLINE adjustment I up]rcm -a DIGITAL DEEP SHALLOW I DEEP 1 ALARM ALARM J SHALLOW SET SET I RESUME FAST STORE I --CHART Thechartspeed is 1 TEMP 4 7 UPPER LIMIT II + J DISC 1 ICOMMA1.! 2 3 5 M/KT/K 6 DIST 8 FT/FA/M 9 DISPLAY SOC LOG PULSE ti 0 N N controlled by theCHARTgroup ofkeys.TheX-50 has 10 chart speeds, ranging fromvery slow to fast Pressingthe FAST key speeds upthechart. TheSLOW keydecreases Thechart speed canbestopped and started again using theSTOP RESUMEkey. it LOWER LIMIT \ DIGITAL SONAR TheX-50is really two sonars in one housing. Themost obvious is the graph,designed to showall retum echoes. The other sonar isthe digital, designed for only one purpose:to show thebottom depth. These keys turnthe digital display offoron and set the digital alem, functions. DISC Discriminationis en adjustable noise rejection system. The levels of adjustment are 0(off) through 10. [CLEARj[ MAD 10F\1[ ON] IN U.S.A. N AUTO A--' a.C B Figure 5 UPPERLIMIT LOWER LIMIT Theupper and lowerlimit keys provide the way to select different depth ranges bypressing the desired depth andthen pressingthe approprieteupper or lowerlimit key.Theupper limit keysets thedepth forthe top of thedisplay, while the lower limit key detemines the depth displayed at the bottomof thescreen. TheAUTO key switchestheX-50in oroutofthe automatic mode. When theX-50 isfirstturned on, itautomatically adjusts thesensitivity and range selection, andthe word AUTO" will bedisplayed inthe upper left of the screen.Bypressing theAUTO key,you can take control of theX-SD, making manual adjustmentsas desired. When theX-50 is in theautomatic mode, theword"AUTO' willbe displayed under thesensitivitybar near thetopofthe display. 7 PDF compression, 38 OCR, web-optimization with CVISION's PdfCompressor OPERATION When the X-50 is first turned on, it automaticallyfinds and displays the bottom depth,sets the sensitivity level, and much more. If desired,the X-50 can be left in this automatic mode to find fish and the bottom conditions they prefer. However, virtually every function of the X-50 can be manually adjusted so that "fine tuning" of the unit to the surrounding conditions canbe made.Takethis manualouton thewateras a reference guide to helpyou getthe mostout of your X-50. [ON] ON TheON key is located in the lower right cornerof the keyboard.It is placed in this location so that itcanbe easily found--even at nightTo turn the X-50on, press the ON key. An audible beep will be heard signifyingthe X-50 knows that a key has been pressed. The chart lights will begin flashing, then stop after six seconds.Thechart will begin scrolling across the display and the number"0"will flash.Thisnumberis the digital bottom depth display. After the unit has found the bottom, the depth will be displayed. Generally, wide cone angle transducers (20 degrees) are ideally suited for operating in shallow to medium water depths. The 20 degree cone angle allows you to see more of the underwater world. In 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,whilethe 8 degreetransducer is used mostly in salt waterIn a deep water environment,(300 feet--fresh water, 100 feet--salt water) the narrow cone angle is more desireable because it can penetrate to much deeper depths since the sound energy is concentrated in a smaller area. Both 8 degree and 20degreetransducers give accurate bottom readings,even though the bottom signal is much wideron the20 degreemodel because you are seeing more ofthe bottom.Remember, the shallow edge ofthe signal showsthe truedepth. Therest of the signal tellsyou whether you are over rocks, mud, etc. Transducerson saltwater boats need to be paintedwith a thin coat of anti-foulant paint to preventorganismsfrom growing. Ifunchecked,barnacles and other marine growth will cause a decrease in the transducer's sensitivity. Do not use a metal based anti-foulant paint as it will decrease the transducer's senstivity. There are special anti-foulant paints specifically designed for transducers.They're readily available at most marine dealers. [OFF 1 OFF To turn the X-50off, simply press the OFF key. SIGNAL INTERPRETATION Because your X-50 is both extremely sensitive and powerful, it can give you an accurate picture ofthe kind of bottom over which your boat is passing. A bottom of firm sand, gravel, shell, or hard clay returns a fairly wide signal. Ifthe automaticsensitivityis turned offand the signal narrows down, it means that you have moved over a mud bottom because mud absorbs the sound wave and retums a weak signal.Turn up the sensitivity. GRAYLINE is especially effective in determining the composition of the bottom. With a hard bottom signal, the grayline will be wide. As the boat passes over the mud bottom, the grayline will narrow down, or it may disappear altogether. GRAYLINE works independently of the automatic function, so it can be used even if automatic sensitivityis on. Big rocksor stumpson a smooth bottom send backsignalsabovethe bottom level signal. Theheight ofthe signal dependson thetarget's height As you approach apostor a treestump,it will be clearly visibleas a short line extending abovethe bottom signal. A steep slope returns a wide signal, the steeper the slope,the wider the signal,with the signal returnedfroma high underwater cliff beingthe widest of all. Brush usually lies on the bottom and shows up as clumps rising above the bottom signal. Brushsignals look similar to large rocks, however their signal is not as strongas rock. 37 2nd [2ND] The X-50 has many different functions, but only a limited amount of spacefor keys. Theretore,some of the keys have more than one function. Each key's primary function is printed in one color, whileit's second function is printed in white. The "2nd" key must be pushed to access the second function printed in white on the appropriate key. For example, the AUTO key is also labeled "LIGHT".If you press the AUTO key by itself, the X-50 will be taken out of the automatic mode. However,ifyoupress the 2nd key, then theAUTOkey, theX-50's lights will be turned on. The 2nd key just reassignedthemeaning of the AUTO key from AUTO to LIGHT. 8 PDF compression, OCR, web-optimization with CVISION's PdfCompressor 18= TOTALSYSTEM RESET The X-50 has an internal battery that keeps power supplied to the memory circuits even whenthe power cable is removed from the unit To resetthe X-50's functions to theirfactory settings, use theTOTALSYSTEM RESET function.TheX-50will restartas if power had been turned oft and backon again. [CLEAR I TRANSDUCERSAND CONEANGLES The sound waves from the transducer spread out intothe waterin a cone shaped beam, much like the beam from a flashlight The angle betweenthe outside edges of the cone is called the cone angle. Lowrance offers a choice of transducers with either an 8 or 20 degree cone angle that will interchange with any of the 192 kHz sonar products. In other words,anyLowrancesonar instrumentcanbe used with any Lowrance transducer of the same frequency with no loss of perfortransducer will result mance.However, the use of any other manufacturers' in a loss of performance. CLEAR If an incorrect key is pressed, wait six seconds and it will automatically be erased or "cleared." TheX-50providesafaster method oferasing mistakes,however.Insteadof waiting six seconds,simply press the CLEAR key and the last entry will be erased. For example,if youwish to turnon the lights,the proper keys to press are 2nd, AUTO. However, if the 0 key was accidentally pressed instead of the 2nd key, youcanpress the CLEARkey which erases the 0 and allows you to start over. TheCLEAR key also erases orsets tozero otherfunctions ofthe X-50 including SCC and Discrimination.Asthe otherfunctions are described in this manual, the CLEAR key's operation will be explained in detail. f LIGHT AUTO AUTO it into the manual mode,press theAUTOkey which is located above the ON key. The word AUTO at the top of the display will be erased, auto Cone Angle Depth Diameter 50 When the X-50is firstturned on, the automatic mode is on. To switch 50' sensitivity and auto ranging will both be cancelled and you will have complete manual control of the X-50. The X-50 Can be returned to the automatic mode at any timeby simply pressingthe AUTO key again. 78. 14 21 188. 100 150 2D0 35 53· 71 28 100' SENSITIVITY Figure 31 ·:11I1IIL'4 II'S [T... SET IGRAYuNEI i_ij 150' 200' 8°at3db 36 When first turned on, the X-50 is in the auto search mode. This means the sensitivity and range are automaticallyadjusted by the microcomputer tofind and lock onto the bottom.Thesensitivitycanbe manually adjusted if desired while in either the automatic or manual mode to suit conditions. The sensitivity level is displayed by a horizontal bar at the top of the display.When the sensitivityis at minimum,the bar isveryshortAs sensitivity is increased, the bar will travel to the right, increasing in length correspondingly. When the sensitivity is set to maximum, the bar will extend across the top of the display.There are 31 steps of sensitivity adjustment. PDF compression, OCR, web-optimization with CVISION's PdfCompressor 9 Automatic Sensitivity When the X-50is in the automaticmode,the sensitivityofthe receiver will be adjusted abovethe minimum required to pick up the bottom signal. This enables the X-50 to display fish, structure, and other small targets while in the automatic mode. Thesensitivitylevel canbe changed whilethe X-50is in theautomatic mode. This may bedesirable ifthe level of sensitivitychosen bythe X-50is not enough to show fish or other small detail. If desired, any amount of sensitivity up to the maximum may be added or anyamount of sensitivity down to the minimummay be subtracted fromthe current setting. To adjust the sensitivity while the X-50 is in the automatic mode, simply press either the right arrow key> to increasethe sensitivityor the left arrow key C to decrease it. Holding the keys down will increase or decrease the sensitivityfaster. If the valuegoes below the minimum,the X-50's audible tone will "flutter".Thesame is trueifyoutry to go above the maximum level. As you press the arrow key, the sensitivity bar will move right or left, according to the amount of sensitivity chosen.The X-50 will still automatically adjust the sensitivity as conditions change, but it will always keep the amount that youadded or subtracted. 17 = KEEL OFFSET' Most sailboats have a keel or a centerboard that extends many feet below the surface.Many power boats with displacementhulls also extend many feet below the surface ofthe water. Thedigital sonar calculatesthe bottom depth fromthe transducer's face. If the boat hull sticks below the transducer, then it can run aground when the digital says there is still clearance. The X-50 provides a keel offset adjustmentthatallowsfor the depth correction betweenthefaceofthe transducer and the bottom of the hull. For example, if the bottom of the hull is 4 feet deeper than the transducer location, then the keel offset on the X-50canbe adjustedby pressing 17 from the menu selection.A new menu will appear: KEEL OFFSET IS 0.0 FT ENTER VALUE IN TENTHS THEN PRESS Sensitivity--Manual Operation At times, it may be desirable to turn the automatic functions off and "fine tune" the X-50 to the current conditions. To manuallyadjust the sensitivity,press theAUTO key once, and auto sensitivity will be turned off. The word AUTO at the top ofthe display will disappear, signifying that the X-50 is in the manual mode.The sensitivity cannow be adjustedto the desired level. Figure 6 demonstrates a graph with too little sensitivity, while on the right, the sensitivity is adjusted properly; a fish is now visible, the surface clutter is more pronounced,and the bottom signal has widened. When the horizontalbar reaches the far right hand side ofthe screen, the sensitivity level is at maximum.If high sensitivity settings are used, a second bottom echo may appear.This is normal and is caused by the returning signal reflecting offthe surface of thewater,makinga second trip to the bottom and back again.This is called "second echo". Occasionally, when high sensitivity levels are used, the display will turnblack. This happenswhen thereare large amounts of surface clutter, thermoclines, turbulent water, or suspended particles such as silt that reflect the sonar signal.This doesnotdamage the unit to correctit, simply turn down the sensitMty level. To return to the Automatic mode, press the AUTO key. Remember, both automatic sensitMty control and auto rangingfunctions are turned off and on by pressingthe AUTO key. OR UPPER LIMIT FOR NEGATIVE OFFSET LOWER LIMIT FOR POSITIVE OFFSET we wantto usea negativeoffset. So, whiletheabove menu is still on the Since the hull in our exampleboat is 4 feet lower than thetransducer, screen, press 40. This is actually 4.0 feet. (Ifyou just press 4, the offset will be .4 or fourtenths of a foot.) TheX-50will now display the depth with a fourfoot offset In other words, if the bottom is fifty feetfrom the transducer face, with afourfoot negativeoffsetthe X-50will display the bottom depth as 46 feet 10 35 PDF compression, OCR, web-optimization with CVISION's PdfCompressor A new menu will appear: SPEED CORRECTION 0% ENTER VALUE IN PERCENT THEN PRESS UPPER LIMIT FOR NEGATIVE CORRECTION OR LOWER LIMIT FOR POSITIVE CORRECTION Run the boat at a steac' speed through a measured mile. At the end of the mile, check the stopwatchto see how long it took. From that you *c can calculate the speed that the boat travelled. If the speedometer is correct, then no correction needsto be made. Ifthe speedometer reading is off, then enterthe percentagethat itis off. For example, ifthe speedometer reads 5 percent fast, once you get the above menu, press 5, UPPER LIMIT. That will give the speedometer a 5% negative correction which should cause it to display the correct boat speed. UllF9II!i SET IGRAYLINEI _iøi._1 GRAYLINE TheGRAYUNE function can be used to outline bottom contour which might otherwise be hidden beneath trees or brush.It will also gve clues to the composition ofthe bottom, i.e. determine if the bottom is hardor soft.A hard bottom returns a very strong signal causing a wide gray line. A soft, muddy or weedy bottom returns a weaker signal whichis emphasizedwith a narrow gray line. 15 = TEST PATTERN ON 16 = TEST PATTERN OFF A test pattern is stored in the X-50's memorythat can be recallea at anytime. It is simplynumbers0 through9 and the letters ofthe alphabet To display the testpattern,once the menuappears,press 15. To turn the test pattern off, get the menu, then press 16. When the X-50 is first turned on, the GRAYLINE level is preset. To adjust it, press the GRAYLINE SET key. Theword "AUTO" in the upper left corner of the screen will change to the word 'GRAY". The sensitivity bar now reads the level of GRAYLINE in use. To adjust the GRAYLINE level higher, press the right arrow key in the SENSITIVITY section on the keyboard. To decrease the GRAYLINE level, press the left arrow key in the SENSITIVITY section on the keyboard.Aftermaking the adjustments,the word "GRAY" will disappear after six seconds and the arrow keys will revert to sensitivityadjustmentagain. 11 34 PDF compression, OCR, web-optimization with CVISION's PdfCompressor $ENSfliV!TY I 8= ENABLE DIGITAL AVERAGING 9= DISABLE DIGITALAVERAGING The digital sonar in the X-50 is a highly sensitive sonar that gives extremely rapid updates of the water depth. Under most conditions,the bottom contour changes so rapidly that the depth display can appear to "jitter". In otherwords, the displaywill change the depth so quickly that it can be difficult to determine the actual bottom depth. To alleviate this situation, the X-50can averagethe bottom readings and place the result on the display.When the X-50 is firstturned on, averaging is enabled.To disable averaging, press the 9 key once the menu appears. To enable averagingonce again,press the 8 key. 10 = BATTERY BACKUPENABLED 11 = BATTERY BACKUPDISABLED Figure 8 GRAYLINE "orr" Figure 9 PROPER SETTING The X-50 has battery backed up memorywhich allowsit to retain all settings even if the power cable is removedfrom the unit.The batterycan be turned off or back on at anytime. When the X-50 is shipped from the factory,the battery is turned on. To turn it off, press 11. To turn it on again, press iO. I stow [ RECALL -- STOP RESUME FAST STORE CHART SPEED When the X-50 is turned on for the first time, the chart scrolls at a pre-determined speed. If a higherspeed is desired, press and hold the FAST key in theCHARTsection ofthe keyboard until it runs at the desired speed.To slowthe display,press and hold the SLOWkey. Whenever either of these keys are pressed, the sensitivity bar at the top of the display will change to a dashed line and the word "CHT" will replace the word "AUTO" nearthe top of the display. The dashed bar representsthe chart speed. If you press and hold the FAST key for example, the bar will start movingto the right, signifyingthatthe chart speed is increasing.There are 10 stepsof chart speed. When the horizontalbar reaches the far right side of the screen, the chart speed is at its maximum value. The X-50 will "flutter" signifying the maximumchart speed has been reached. lithe automatic mode or digital function is on, the maximum chart speed cannot be attained.(The chart barwill stop two steps from the far right and the audible tone will "flutter".) Turning both the digital and the automatic mode off will allow the maximum chart speed to be attained. (Ten steps ofchartspeed are available ifthe digital and AUTOare off, Eight steps of charts speed availablewith digital and AUTO on.) 12 = SCALE ON 13 = SCALE OFF Theupper and lower limit numberson the right side of thedisplaycan be turned on or offas desired. When theX-50 is shipped from the factory, the scales are turned on. To turn them off, press 13 afterthe menuappears. To turn them back on again,press 12. 14 = CALIBRATESPEED Due to variations in boat hulls and sensor mounting locations, the speedometer on the X-50 may need to be calibrated. The X-50 allows corrections to be enteredusingthe CALIBRATE SPEED command.To use it, press 2nd, DISC(COMMAND) until the CALIBRATE SPEEDfunction on the menu appears.Then press 14. 33 12 PDF compression, OCR, web-optimization with CVISION's PdfCompressor 2= GRAYLINECHECKERBOARD 3= GRAYLINELINES GRAYLINE can be displayedon theX-50with a checkerboard pattern or with lines and spaces. When the X-50 is shipped from the factory,the checkerboard pattern is enabled. To change to lines, press the 3 key. To switch back,press the 2 key. 4 = SPEAKERVOLUME Thevolume of the speaker can be changed by pressing the 4 key. A message will be displayed on the screen: USE SENS. KEYS TO ADJUST VOLUME(the sensitivitykeysare used to adjust the volume ofthespeaker) and the speaker will begin beeping. Pressing the right arrow key will increase thevolume,theleft arrow key decreasesit.Thesensitivitybarwill move to the right or left, signifying the volume level.The speaker will stop beeping six seconds after the last key has been pressed. To view the chart speed withoutchanging it, press 2nd, STOP/RESUME. The sensitivity bar will disappear and the chart speed bar will replace it for a six seconds. At times it is desirable to stop or "freeze" the display to examine an echo before it scrolls off the screen. Pressing the STOP/RESUMEkey once will freeze thedisplay.In the upper left corner ofthe display,theword "AUTO" will change to "STOP" to signify that the X-50 is in the "freeze" mode. PressingSTOP/RESUMEagain will start the display moving atthe last chart speed setting. If the digital sonar is on, the bottom depth will continueto bedisplayed on the screen.Thedigital does not stop when the chart is in the "freeze" mode. 5= CLEAR DIST LOG The distance log will start operatingfrom the time the X-50 is first turned on. To resetthe distancelog to zero, pressthe 5 key whilethe menu is on the screen. SCALE MARKERS There are ten scale markers printed on both sides of the X-50's display to helpyoudetermine whatthe depth ofa target is. For example,if the range is 0-60feet, and a target(such as a fish) was displayed next to the fifth line, then it is 30 feetdeep. (60feet divided by 10 lines= 6 feet per line. 5 lines times 6feet per line = 30 feetjThis method works no matter whatthe upper and lower limits are, but to make it easier use upper and lowerlimits in multiples often, i.e. 10, 20, 30, etc. 6= NARROWAUTO RANGEWINDOW 7 = WIDE AUTO RANGEWINDOW The limits that the X-50 will autorange can be changed if desired. When the X-50 is first turned on, the narrow autorange is enabled.This means that if the bottom signal goes below the 90% point on the screen, the X-50 will autorange and place the bottom signal at the 50% point on the screen. Ifthe bottom signal goes above the 40%position, theX-50will autorange and place it at the 80%position on the display.This keeps the bottom signal in the lowerhalfof the display,allowing you to see fish and other targets. Thewide autorangewill move the bottom signal to the 25% pointif it goes below the 90% point. If the bottom signal goes above the 15%point, then the X-50 will autorange it back to the 80% point. This allows the bottom signal to travel almost the entire vertical area of the display.The only disadvantageto this is thatechoes above the bottom signal cannot be seen whenthe bottom signal is near thetop ofthe screen. However,ifyou wish to only track the bottom signal,while keeping the automatic range changes to a minimum,then the wide autorangewindowwill be useful. To change to the wide autorange,press the 7 key while the menu is on the screen. To change backto narrow autorange,press the 6 key. SCALE MARKERS SCALEMARKERS Figure 10 PDF compression, OCR, web-optimization with CVISION's PdfCompressor 32 13 To use the scale markers with azoom, simplysubtract upper limit the from the lower limit, then divide that number by ten to get the number of feet per line. For example,if atargetis on the third line and the upper limit is 120 feet with a lower limitof 160 feet, then subtract 120 from 160 which equals 40. To get the number of feet per mark, divide 40 feet by 10 lines which equals 4. Now multiply4 times 3 (targetis at the third line) and you get 12. Add 120 (upper limit) to 12 and the depth of the target is 132 feet deep. -S H hi I- I RANGE When the X-50is in the automatic mode, the ranges will automatically change to keep the bottom signal on the display as the bottom depth changes. At times, however, it may be desirable to expand the range or zoom in on a target.The upper limit canbe set from 0 to 6490 feet and the lower limit can be setfrom 10 to 6500 feet Any combination of the two limits may be used, providedthatthe lowerlimit is no closer than ten feet to the upper limit. If a segment less than ten feet is entered, the X-50 will 'flutter" and the range will remain at the previoussetting. (Note: Maximum depth capability will depend upon the water and bottom conditions,type oftransducer,and qualityoftransducer installation.) -52,Q H F "'i--i LOWER LIMIT LOWER LIMIT Automatic Operation When the X-50 is firstturned on, it will automaticallyfind and display the bottom signal,picking a lowerlimitthatwill put the bottom signal in the lower portion of the display.As the bottom depth changes, the X-50 will automatically change the lower limit to keep the bottom signal on the display.When the X-50changes ranges while in the automatic mode, the lower limit selected will always be a multiple of ten. In other words the lowerlimitwill be a numberthat ends in zero suchas ten, twenty, forty,one hundred, etc. The lower limit may be changed while the X-50 is in the automatic mode, howeverthe lower limit cannot beset shallower than the bottom.If a lowerlimitis chosen that is lessthan the bottom depth,theX-50will ignore the command. To change the lower limit while the X-50 is in the automatic mode, simply press the desired depth, then the LOWER LIMIT key. For example, changing the lower limit to 50 feet requires the following keys to be pressed: 5, 0, LOWERLIMIT o = FASTRAK ON 1 = FASTRAK OFF FASTRAK is afeaturethatconvertsall echoes toshort horizontalbars on the far rightside ofthe display.Thegraph display continues to operate normally, however In essence, FASTRAK is a vertical bar display that enables you to determine a target's depth easier For example, see figure 30 above.WithFASTRAK enabled,the fish echo is makinga mark close to the 8th line on the scala With an upper limit of 0 and a lower limit of eo, then each scale mark is 6 feet which places the fish at approximately54 feet. Since FASTRAK is so close to the scale markers, it makes it a little easier to line up the targefsdepth with the scale. To turn FASTRAK on, press the 0 key. To turn FASTRAK off, press the 1 key. 31 14 PDF compression, OCR, web-optimization with CVISION's PdfCompressor COMMAND The X-50 has many more features than available keys. The COMMAND key lets you access 'menus" of other functions. A typical menu looks like figure 29. To find the desired function, press 2nd, DISC (COMMAND). The first menu will appear for six seconds as shown in figure 29. If you don't see the desired function, press the DISC (COMMAND) key again. Continue pressing it until the desired function is shown on the display.All of the functions will be numbered.To activate the desired function,simply press the number on the keyboardthat correspondsto the function. A faster way to execute menu functions is to press the function's number first, then press 2nd, DISC (COMMAND). For example, the CLEAR DISTANCE LOG function is number 5. To clear the log one must either press 2nd, DISC (COMMAND), then press DISC (COMMAND) until the CLEAR DISTANCE LOG function is displayed and press the number 5 on the keyboard, or simply press 5, 2nd, DISC (COMMAND). Both methods can be used on all menu functions. Each of the functions are listed below in order of appearanceon the menus.Remember, 2nd, DISC (COMMAND) must be pressed to enable or disable any of the following functions. Manual Operation Thelowerlimit maybe changed to anysettingwhiletheX-50 is in the manual mode, regardless of where the bottom signal is. To change the lowerlimit in manualmode, firstmake certain the word "AUTO" is not displayed at the top of the screen, signifying that the automatic mode is off. (Note: This also disables the automatic sensitivity function.) If the automatic mode is on, press the AUTO key onceto disable it Next, enter the lower limit desired from 10 to 6500 feet and press the LOWERLIMIT key. The display will immediately change to the new depth range and display the new lowerlimit at the bottom of the screen. Forexample,to setthe lowerlimit to 31 feet, press 3, 1, LOWERLIMIT -SENSJTIIJITVJ_.-- 0 FASTRAK ON 1 FASTRAK OFF 2 GRAYLINE CHECKERBOARD 3 GRAYLINE LINES 4 SPEAKER VOLUME 5 CLEAR DISTANCE LOG 6 NARROWAUTORANGE WINDOW 7 WIDEAUTO RANGE WINDOW 8 ENABLE DIGITAL AVERAGING 9 DISABLE DIGITALAVERAGING 10 BATTERY BACKUP ENABLED 11 BATTERY BACKUP DISABLED 12 SCALEON 1! UPPER LIMIT 13 SCALEOFF 14 CALIBRATE SPEED 15 TEST PATTERN ON 16 TEST PATTERN OFF 17 KEEL OFFSET 18 TOTAL SYSTEM RESET UPPER LIMIT Often it's desirable to expand or "ZOOM" a section of the display to show more detail. You can do this on the X-50 by using the Upper Limit feature. When the X-50 is in automatic,the upper limit is automatically set to zero and cannot be changed while in the automatic mode. (Unlessthe Auto Range with Zoom Bottom Track feature is used. See page 16 for details.)However, ifthe X-50is in the manualmode, any upper limit may be chosen provided it is no closerthan ten feet to the lower limit 15 30 PDF compression, OCR, web-optimization with CVISION's PdfCompressor To change the upper limit of the display,firstmake certainthe X-50 is in the manual mode. Then simply press the desired depth (any number between 0 and 6490 feet) and then the UPPER LIMIT key. Remember, the only restriction on the upper limit is that it must not be closer to the lower limit than 10 feet In other words, if the lower limit is set to 80 feet, the upper limit cannot be set any closerthan 70 feet. A ten foot segment or larger is required. Upper and lower limits may be set in various combinationsto show segments from the surface to the bottom and anywhere in between.This permits a scale expansion or "zoom" of a portion of the display. Example: Set the range from 16 to 31 The digital bottom depth will revert to the medium number size, all alarms will be turned off, the speedometer,temperaturedisplay, and log will also be turned off. Automatic will be turned backon. Therange will be changed if the bottom signal is not on the display. The memoryfunction can be turned off if desired. For more information, seethe COMMANDfunction on page 30. feet -M:y iS RESUME Press: 1, 6, UPPER LIMIT, 3, 1, LOWER LIMIT I scow FAST STORE (EALL UPPER LIMIT DISPLAY MEMORY TheX-50 hastwo "pages" of display memoryavailable,allowing you to store an entire screen when desired. Thanks to the internalbattery, the display memory can be retained even if power is disconnected from the X-50. By pressingafew keys,the displaythat is currentlyon the screenwill be stored into memory,completewith upper and lowerlimits, digital bottom depth, temperature,and speed. If any or all of these functions are displayed on the screen, then they will be stored and displayed when Figure 12 recalled. There are two memory locations for display memory, numberedone and two. To store the current display into number one, press 1, 2nd, FAST (STORE). The current display is now stored in location one. To store a different display,press 2, 2nd, FAST (STORE). Now two different displays are stored into memory. Ifdesired, new displaysmay be stored into thetwo locations by pressing1, 2nd, FAST (STORE) or 2, 2nd, FAST (STORE), but the previousdisplaywill be erased each timea new display is stored. LOWER LIMIr S BTM TRK_- 8 AUTO RANGE WITH ZOOM BOTTOM TRACK Although the upper limit cannot be directly changed while in the automatic mode, a "window" can be chosen that will track the bottom signal and show an enlarged or "zoomed" picture ofthe underwaterworld using the AUTO RANGE with ZOOM BOTTOM TRACKfeature. To recall a display stored into memory, simply press the memory location number, either one or two, then the 2nd key, then the SLOW (RECALL) key. For example, to recall display one, press 1, 2nd, SLOW (RECALL).Thedisplaythatwas stored in memory location numberone will immediatelybe displayed.Itwill remain on screen until any key is pressed. TheCLEAR key is agood one to usefor that. NOTE:When storingor recalling a screen into memorylocation 1, the 1 does not have to be pressed. For example, press 2nd, FAST (STORE) instead of 1, 2nd, FAST (STORE) to store a screen into memory or 2nd, SLOW (RECALL) instead of 1, 2nd, SLOW (RECALL) to recall screen memory 1. 16 29 PDF compression, OCR, web-optimization with CVISION's PdfCompressor PULSE In sonar,thereis a relationship betweentransmitterpulse length and resolution. Resolution, in this case, is the ability of a sonar to separate targets.The shorter the pulse length,the better thesonar's abilityto separate targets. However, in deep water, the shorter the pulse length, the less likely a return echo will be received. In fact, the X-50 automatically increases the pulse length as the depth increases. In shallow water, a narrow pulse length is beneficial,since theprobability ofechodetection is high. For even better target separation,the X-50 gives you the capability of changing thepulse length to a more narrow lengththan would normallybe used. Combine the narrow pulse length with a 10, 20, or even a 30 foot segment or "zoom" and the X-50 will display small detail far better than other Liquid CrystalGraphs. To change to a narrow pulse, press 2nd, 0 (PULSE). A menu will appear (see figure 28). Simply press 2 forthe narrow pulse length. Iffishing in deeper water, press 2nd, 0 (PULSE) and then press 1 to switch backto normal pulse length. To use this feature,azoom window must be chosen.For example, use a 20 footzoom window. This meansthatthe X-50will keep the upper limit setting 20 feet above the lower limit and place the bottom signal in this window,tracking it as it moves shallower or deeper.Press 2, 0, 2nd, 8. The X-50 will choose an upper and lower limit thatwill placethe bottom signal in the 20 foot window. The bottom will be tracked and always kept inside this window, If the segment size is 40 feet or greater, the bottom will be tracked with window limits ending in zero (10, 20, 30, etc.), otherwise the limits will be in one foot increments. __LssJs,r'vIrv - __:___. - _1 -- ::i:-!I:: 41-- .._ Cr: ff'1JJJLi) - FO CH-!4GE F'EEZ.S NO H -- Figure 13 key to turn off the automatic mode. Figure 28 I10TH To exit from this function, press 2nd, 8 (BRM TRK) or press the AUTO -- ·'] ethr.]ri:· DIGITAL SHALLOW ALARM DEEP ALARM ( PREJ PRESET The X-50 has an internal battery that keeps power supplied to the memory circuits even when the power cable is unpluggedfrom the unit. This allows the X-50 to retain all the settings that were in effect when it was last used. However, at times itmay be desirableto erasethese settings and start over. Using the PRESET function allows the X-50 to be reset to the factory standard settings. To reset the X-50, simply press 2nd, *(PRESB) len DIGITAL A complete digital sonar is built inside the X-50. It automatically discriminates between the valid bottom echoes and false echoes from fish, thermoclines,or othersignals.Thedigital displaywill show only thebottom depth.It can be used any time, regardless ofthe mode the X-50 is in. Remember, if the chart is in the freeze mode,the digital display will continueto show the bottom depth as it changes. It doesnot freeze when the chart does. 17 PDF compression, OCR, web-optimization with CVISION's PdfCompressor 28 When the X-50 is first turned on, the digital will flash "0" until it has "lockedon" to the bottomsignal. Once it has acquired the bottom depth, it will display the depth in the lower left of the display. I Figure 26 BOAT SPEED n [I Figure 27 Figure 14 DIGITAL BO1TOM DEPTH Figure 15 There are three different sizesof the digital numbersfor the display, small, medium,and large. When first turned on, the digital numbersize is medium. To change to a different size, press 2nd, 7. A menu will appear (see figure 15) and you will be prompted to press the 1 key forsmall digital numbers, 2 for medium, or 3 for large digital numbers. After pressingthe desired numberon the keyboard,the menu will disappear.If numberthree, "large digital" is selected, the chart will not be displayed (see Figure 16). Instead, the screen will be cleared, the bottom depth will be displayed in large digits, speed and temperature will also be displayed (if turned on), and the depth alarm settings will be displayed atthe bottom of the screen. Thisturns the X-50into a digital sonar only and allows itto better track the bottom signal. One reason to usethe digital in this mannerwould be ifyou are going to travel at high speed fromone partof a laketo anotherandyou just wantto know the bottom depth.Thiswill give both the fastest possible depth updates plus an easy-to-read display. To change back into "normal" mode, simply press 2nd, 7 again and choose either I, small numbersor 2, medium numbers. The digital display can be turned off by pressing the DIGITAL key in the DIGITAL SONAR portion of the keyboard. DIST LOG LOG If the optional speed sensor, model LSS-5 is attached to the X-50, then total distance travelled or log canbe displayed on the X-50's screen. To display the log, press 2nd,5. The distance travelledsince the X-50was last turned on will be displayed in statue miles. To reset the log, see the COMMANDfunction key instructions on page 30. To turn the log display off, press 2nd, 5 again. 51 FT/F A/M 9 FEET-FATHOMS-METERS The X-50 can display the depth in either feet fathoms, or meters. When it isfirstturned on, the display reads in feet To change it tofathoms or meters, press 2nd, 9(FT/FA/M). A menu will be displayedon thescreen (see figure 27) indicating that the depth is in feet To change to fathoms, press the 2 key on the keyboard, or press 3 to change to meters.For no change press the CLEAR key. After the selection is made, the unit will resume operation. 18 27 PDF compression, OCR, web-optimization with CVISION's PdfCompressor DIGITAL BO1TOMDEPTh Figure 16 8CC OFF SCCADJUSTED PROPERLY Figure 24 To viewthe 5CC level, simply press 2nd, 3 (5CC). To turn 5CC off, press 0, 2nd, 3 (5CC). Figure 25 10th The digital sonar will displaythe bottom depth in tenths of afoot If the bottom goes deeper than 99.9 feet, tenths will automatically be disabled and the bottom depth will be displayed in whole numbers.Tenths will not come back on automaticallyif the depth goes deeper than 99.9 feet and comes back above 100 feet If desired, tenths can then be turned on by pressing 2nd, DIGITAL (tenths)in the DIGITAL section of the keyboard. To turn tenths off, press 2nd, DIGITAL SPEED If the optional speed transducer, model LSS-5 is installed, then the X-50 is capable of displayingboat speed and distance travelled or log. To display the boat speed, press 2nd, 4 (SPEED). The current boat speed in statue miles per hour will be displayed immediatelyabove the digital bottom depth. To change to knots or kilometers, press 2nd, 6(M/KT/K). A menu will appear (seefigure 26) askingyouto press 1 for statue miles per hour, 2 for knots, 3 for kilometers per hour To turn the speed display off, press 2nd, 4 (SPEED) again. The zone alarm has an indicator bar on the leffside of the screen. The alarm then "chirps" and the words "ZONE ALM" will flash on the display whenever any echo such as a fish, school of fish, or the bottom echo is detected inside the boundaries ofthe zone alarm bar ALARMS TheX-50 hastwo different alarms,a zone alarm and a depth alarm. 19 PDF compression, OCR, web-optimization with CVISION's PdfCompressor 26 The depth alarm has upper and lower limits, but they do not have to be usedtogether. Only the bottom signal will trigger the depth alarm. Fish, noise, or any othertargets will not set it off. Thedepth alarm sounds with a fastbeep whenever the bottom echo is detected shallower than the alarm upper limit and a slow beep when the bottom is deeper than the alarm's lowerlimit Thewords"DEPTHALM" flashes on the display whenever the depth alarm is triggered. --enIIsiu;LcI SHALLOWI LAJA.AJ SET I DEEP I ZONE ALARM SET It 4I DISPLAYJ TheZone Alarm can also be thought of as a fish alarm. It will sound when an echo is detected inside its window. To set the Zone Alan-n, press the SHALLOWSET key in the ZONE ALARM section ofthekeyboard.Thewords "ZONEALM" will be displayed in the lowerleft corner of the screen.Avertical bar will be displayedon the leftside of the screen. This is the Zone Alarm's "window". Any echo that appears betweenthe top and bottom of this bar will sound the alarm. Both the shallow and deep ends of this bar can be adjusted to make a smaller or larger alarm "window' SEWSITiVTV Figure 22 Figure 23 I.- 5CC 3 ZONEALARM BAR Figure 17 SURFACE CLARITYCONTROL The markings at the top of the display can attimes extend many feet below the surface. This can interfere with fish signals or other targets. These markingsare called Surface Clutter and are caused bywave action, boat wakes, bait fish, temperature inversions,and other causes. The surface clutter can be reduced or eliminatedby usingthe Surface Clarity Control or SCC. 5CCvaries the gain ofthe receiver between each transmit pulse, while the receiver is "listening"for the return echoes. The gain is the lowest for echoes nearthe surface. It is gradually increased as the depth increases. The maximum depth that SCC will affect is threequarters of the selected depth range. For example, on a 0to 60 foot range, 5CC would have an effect from the surface to 45 feet