Raymarine L470 instruction manual Fish Indications, Operating Instructions, kHz 200 kHz

Page 44
Fish Indications

Fish Indications

Even using advanced sonar technology, it is sometimes hard to detect a fish in the water. The body of a fish is just a little more dense than the surrounding water. There is really nothing very solid for the sound waves to bounce off of. The FishFinder L470 is very good at telling the difference between a fish and the surrounding water. In fact, Raymarine is the leader in this technology.

When the FishFinder detects a fish, it can be indicated by a fish symbol on the display. In general, a larger symbol means a larger fish. This rule is not always true, though. Let’s say that there are two fish of the same size: one is close to the surface, and the other is near the bottom. The fish which is close to the surface will have a larger symbol. This is because the fish which is closer returns more of the sound waves back to the FishFinder.

Actually, the sound waves are usually reflected by the air sac near the center of the fish, and not by the body of the fish. The size of this air sac is different for different kinds of fish. This can also affect the size of the

50 kHz 50 kHz

200 kHz

An arch-shaped image indicates a fish.

The same fish appears differently when shown by the 50 kHz or 200 kHz transducer beams.

This indicates a group of small fish.

This shows a fish detected in sidelooker mode.

A shallow arch or horizontal line is generated when the boat is moving slowly or stopped.

When the boat is moving very fast,

a fish appears as a single vertical line.

Fig. 3-5

Fish Indications

38

Operating Instructions

Image 44
Contents FishFinder L470 Instruction ManualRaymarine Contents InstallationIntroduction Operating Instructions4 Setup Instructions Maintenance and Troubleshooting SpecificationsList of Figures Pageviii Frequency Menu ItemIntroduction 1 - IntroductionAbout the FishFinder L470 Optional Accessories System ComponentsStandard Equipment Standard TransducersTransducer switch box select between two L470 About the Transducer 2 - InstallationInstallation Selecting the Correct Type of Transducer Use a transom-mount transducer ifUse a thru-hull transducer if Use an in-hull transducer ifAssembling the Transducer Bracket Positioning the Transom-Mount TransducerUse a trolling motor transducer if Use a Sidelooker transducerTransducer Mounted on Transom Transducer Bracket Side ViewAllow a clearance of at least 10 inches 254 mm 10 254 mm Transducer in released positionMounting the Transducer No!No!NoCorrect Mounting Position Mounting the Transom-Mount Transducer 3. Remove the two screws and the bracket covering the paddle wheels Installation Notes - Thru-Hull Transducer Installation Notes - In-Hull Transducer Installation Notes - Trolling Motor Transducers EMC Installation Guidelines Installation Notes - Transducer for Speed and Temperature OnlySuppression Ferrites Mounting the Display Unit - Standard Mount Dismounting the Display UnitDimensions 2-25/3270 mm 210 mmMounting the Display Unit - Flush Mount Flush-mount InstallationInstalling the Transducer Cable Disassembling from BracketFiberglass 1/4 6mm Aluminum 1/2 13 mm Installing Cable on TransomCable feed-thru cap Cable clamp 1 25 mm Hull projections Installation with Separate Speed and Temperature Sensors Installing the Transducer Cable - Sidelooker OptionInstalling the Transducer Cable Making the DC Power Connections RF ground DC Power ConnectionsDC 12V connector to battery T/D connector to transducer RED BLACK Calibrating the Sensors higher value for Speed Cal. If the display unit is reading high, use a smaller number for Speed Cal. You may enter any value between 75 and Operating Instructions 3 - Operating InstructionsControls on Display Panel CLEAR Up and down arrows - andLeft and right arrows - and Turning the Power On and Off Setup MemoryLamp/Contrast Menu Operating Pages ModeFunction See pageOnly if Sidelooker feature is turned onAuto frequency on Transducer frequency FishFinder PageShallow alarm set Top of display Fish alarm set This entry shows the speed of the boat through the water Center of displayFrom the System Setup Menu, you can turn this item off or Bottom of display Choosing a Frequency Fish Indications When the boat is moving very fast50 kHz 200 kHz An arch-shaped image indicates a fishBottom Indications Rocks Bottom ConditionsHard Sand Soft Mud Window Page WindowContentsOptions for Window Page Option A Option C Option E Option GOption B Option D Option F Option H Sidelooker Page Once the Sidelooker feature has been turned on, you can reach the Sidelooker page easily. Press the or buttons on the Page Control Pad until the Sidelooker Page appears. The unit will present a display similar to Fig Here are the special items on this display Bottom/Shore Digital Page button. The Log may be reset to zero from the Zoom Mode A-Scope ModeBottom Lock Mode Performance ModesZoom display Performance ModesZoom Mode Zoom magnification A-Scope Bottom Coverage Mode Bottom coverage Bottom Lock Mode the selected range, then Bottom Lock will not display the bottom image 4 - Setup Instructions The Setup MenuSetup Instructions Fig.4-1Sidelooker Range SettingSetup Instructions Sensitivity Setting Auto sensitivity Chart Speed Setting Changing the Chart Speed SettingFrequency Setting AUTO frequency Resetting the Log System Setup Menu Fig.4-8different languages. English is the default language which The unit can present the display information in one of sevenSetup Instructions Shallow Alarm For example, if the temperature reading onCLEAR conditions occurs shallow, deep, or fish alarm. For the water. You can silence the buzzer again by pressing theCode Units used for speedUnits used bySetup Menus for Zoom Mode Zoom Select Menufeature is particularly useful when fishing for species of fish button to leave this display, and store the Auto Zoom settingZoom Screen Split/Full Menu Item Setup Menus for Bottom Lock Mode Bottom Lock Range Menu ItemBottom Lock Split/Full Menu Item Setup Menu for Window Page Resetting from the Digital Page Setup Instructions for SidelookerSidelooker Range Menu Item Sidelooker Chart Speed Menu Item Sidelooker Sensitivity Menu ItemSidelooker View Menu Item Display Option Information ShownCombining Displays Resetting the Unit to Factory Defaults Default Settings Default - US model Default - Europe model5 - Maintenance and Troubleshooting Cleaning InstructionsTroubleshooting Suggestions Maintenance and TroubleshootingThe display unit “freezes” temporarily or permanently The display unit does not see the bottom or fish The FishFinder does not display fish archesThe depth setting flashes often The display unit shows lots of background “noise”How to Contact Raymarine For marine product and services informationFor accessories and parts Servicing a Thru-Hull TransducerFor product repair service For technical supportPrepaid Return Service Raymarine in EuropeMaintenance and Troubleshooting General Information 6 - SpecificationsSpecifications FishFinder Functions Feet, fathoms, metersConnector Diagrams ConnectorsGlossary of Terms GlossaryNautical mile 6076 feet Statute mile 5280 ftLimited Warranty Certificate Warranty Limitations