Furuno CSH-23F/24F manual Application to Bonito and Tuna Fishing, Display Indications, Searching

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Display Indications

Figure 8-3 Indications of vertical scanning display

Application to Bonito and Tuna Fishing

Tracking of bonito and tuna presents a special challenge to the sonar operator: He must try to keep them within the sonar beam, a formidable task considering their high speed and penchant for leaping and diving. The CSH-23F/24F, however, with its wide vertical scanning beam, makes this task easier.

Searching

Neither the naked eye nor binoculars can continually track fish schools which make lightning quick runs between the surface and midwater. A sonar, however, provides a continuous view of several hundred meters of sea area around the boat, both at the surface and below it.

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Contents Color Scanning Sonar 00080818600 Safety Instructions Do not use the equipment for other than its intended purpose Table of Contents Vertical Scanning Display Self Tests This page is intentionally left blank Foreword FeaturesWord to CSH-23F/24F Owners System Configuration Standard OptionControl Layout on Display Unit and Remote Control Box Control DescriptionMain Panel Main panel control descriptionNORM, E/S, Hist RECALL, MemoRange GainSub Panel Control FunctionSub Panel 2 data setting window Signal AGCProcess 2AGCAlarm SonarUP/TM SonrbeamRemote Control Box + +Turning the Power On/Off Adjusting Screen Brilliance, Control Panel BacklightingOperational Overview Lowering the TransducerMode Selecting a Display ModeDescription Selecting a Display Range Setting the Tilt AngleSeabed echo and tilt angle How to discriminate fish echoes from the seabed Points to considerTilt angle for surface fish Tilt angle and sea surface reflectionsSuitable tilt angle Tilt angle and beam coverageAdjusting the Gain Measuring Range and Bearing to a TargetPage How to adjust TVG Fine Tuning the PictureEliminating Unwanted Feeble Echoes Page AGC data setting window SIGNAL, Signal Pulselength data setting window TVGTX, PL2AGC data setting window SIGNAL, Signal Process Suppressing Seabed TailRejecting Sonar Interference and Noise Data setting window TVGTX, OutputIdentifying noise source Changing Tx cycle data setting window Tvgtx CycleAdjusting Beamwidth Setting F-shift data setting window SonrbeamNoise limiter data setting window SIGNAL, Signal Menu ApplicationNormal display mode Marks, Data and Display ModeMarks and Data Normal display mode w/text Echo sounder combination displayHistory display Permanently Displayed Marks and DataMark/Data Description Erasable Marks and Data Bearing marker Mark Description Range R Auto Tilt Auto Scan Gain Brill TVG TVG DIM This page is intentionally left blank Menu Overview Menu How to openUser Menu Operation Menu screen location and display mode User Menu Hist DSP/GRPHUser Menu Description Menu Menu Item DescriptionCurrent VEC Save PictureFAR TVG System Menu DescriptionTM DSP Data Display BRG ReadoutMark Size Defaults ES/NET RECHist Display InterlockData SET Menu Description Color CurveChange Color NET Shoot PlanNET Sonde NET Plot CorrInit SET/TEST Menu Description Menu Description Echo TestFunction Keys Programming the Function KeysFunction Key Fine Tuning Replaying a Function KeySaving Function Key Settings to a Memory Card Replaying Function Key Settings from a Memory CardThis page is intentionally left blank Advanced Level Operation Finding Fish School CenterTracking a Fish School target lock Tracking a fish schoolTarget lock mark appearance Choosing target lock modeErasing target lock mark Tracking target lock mark Target lock and tilt angleSetting target lock conditions System Menu Target LockDescription of target lock items Detecting Fish Schools Aurally Fish Alarm How to set the fish alarm zoneHow to relocate fish schools Relocating Fish School for Easy ObservationComparing of Fish School Concentration Estimate marks and their dataHow to measure fish speed Measuring Fish School SpeedEvent Mark 10 Event marksEntering an event mark Erasing an event markTrue Motion Display 12 True motion displayPlotting Net Location Mark 13 Net location markObserving Net Behavior 14 Net behavior Target Slice Display No. Display Information ApplicationsThis page is intentionally left blank Using Vertical Scanning Display Vertical Scanning DisplayDisplay Indications Application to Bonito and Tuna FishingSearching Tracking ApproachingCatching CatchingPORT/STARBOARD, Horizontal Slice Displays Port/Starboard displayHorizontal slice display Horizontal slice displayMemory Card Operations Initializing Memory CardsTransferring Echo Data from Internal Memory to Memory Card Saving the PictureData to Save Saving Method Saving to Net shooting data contents Saving Net Shooting DataHow net shooting data is saved Transferring net shooting data to memory cardDeleting Memory Card Contents Replaying Saved DataTurning MARKS, Data ON/OFF Turning marks on/off through the data setting windowTurning marks on/off through the user menu This page is intentionally left blank Interpreting the Display Seabed EchoesFish Schools Midwater, bottom fish Tilt angle 30 or moreSea Surface Reflections WakeFalse Echo by Sidelobe Noise and InterferenceOvervoltage Warning Unretracted Transducer WarningHow to manually raise the transducer Self Tests Opening the Self Test MenuSingle test Self Test DescriptionContinuous test Panel test Color testGray test SIO testInterface Unit CS-120A Self Test Interface unit CS-120A, cover openedThis page is intentionally left blank Input Data Selection Selection of Data at Interface Unit CS-120ASetting Distances Between Net Sonde Transmitters How to set net sonde transmitter distancesMaintenance Display Unit MaintenanceHull Unit Maintenance Zinc block near the transducer must be replaced yearlyMenu Tree User MenuData SET Menu Init SET/TEST Menu System Menu Previous This page is intentionally left blank Specifications SP-1Display SP-2Hull Unit SP-3This page is intentionally left blank Index 12-2IN-2