Furuno CSH-84, CSH-83 manual Detecting Fish Schools Aurally

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Detecting Fish Schools Aurally

Sometimes you may be preoccupied with other tasks and unable to concentrate on watching the sonar picture. In such cases it would be a good choice to use the audio function. This function enables you to monitor echoes from fish schools and seabed through the built-in speaker.

After you’ve become accustomed to monitoring fish aurally, you should be able to detect a fish school from a range longer than you can detect it on the screen. In addition you may judge whether the fish school is approaching or going away; the tone becomes higher when the school is approaching and lowers when the school is going away.

1.Operate the trackball to place the trackball mark to the direc- tion you want to monitor through the speaker.

2.Press the R/B key. The bearing mark appears on the display. Echoes in a 30° , 60° , 90° , 180° or 330° sector centering the bearing mark are monitored through the speaker. You can adjust speaker volume with the AUDIO control.

3.To change coverage area, open the data setting window (sub panel 2) and change width of AUDIO SECTOR.

4.To scan the coverage area, open the data setting window, turn on AUTO SCAN and set scanning WIDTH.

Note: You can display the signal monitored through the loud- speaker on the history display combination window by pressing the HIST key, if AUDIO is selected on the HIST Window DSP menu in the USER menu.

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Contents Color Scanning Sonar 00080806600 Safety Instructions Do not use the equipment for other than its intended purpose Table of Contents PORT/STARBOARD, Horizontal Slice Displays Self Tests This page is intentionally left blank Features ForewordWord to CSH-83/84 Owners Standard Option System ConfigurationControl Description Control Layout on Display Unit and Remote Control BoxMain panel control description Main PanelControl Function END Sub PanelSub Panel 2 data setting window 2AGC SignalAGC ProcessSonrbeam AlarmSonar UP/TM+ + Remote Control BoxLowering the Transducer Turning the Power On/OffAdjusting Screen Brilliance, Control Panel Backlighting Operational OverviewDisplay mode description Selecting a Display ModeSetting the Tilt Angle Selecting a Display RangeSeabed echo and tilt angle Points to consider How to discriminate fish echoes from the seabedTilt angle and sea surface reflections Tilt angle for surface fishTilt angle and beam coverage Suitable tilt angleMeasuring Range and Bearing to a Target Adjusting the GainPage Fine Tuning the Picture How to adjust TVGEliminating Unwanted Feeble Echoes Page Suppressing Seabed Tail AGC data setting window SIGNAL, SignalPulselength data setting window TVGTX,PL 2AGC data setting window SIGNAL, Signal ProcessData setting window TVGTX, Output Rejecting Sonar Interference and NoiseIdentifying noise source Cycle Changing Tx cycle data setting window TvgtxSetting Noise limiter data setting window Signal Adjusting BeamwidthMarks, Data and Display Mode Normal display modeMarks and Data Echo sounder combination display Normal display mode w/textHistory display Permanently Displayed Marks and DataMark/Data Description Erasable Marks and DataBearing marker Mark Description Range R Auto Tilt Auto Scan Gain Brill TVG TVG DIM Page User Menu Operation Menu OverviewUser Menu Hist DSP/GRPH Menu screen location and display modeUser Menu Description Save Picture Current VECTarget Lock System Menu DescriptionFAR TVG TM DSPMark Size BRG ReadoutMenu Description Color Curve Data SET Menu DescriptionChange Color NET Plot Corr NET ShootPlan NET SondeInit SET/TEST Menu Description Others Event KEY DefaultsEcho Test NET RECProgramming the Function Keys Function KeysReplaying a Function Key Function Key Fine TuningReplaying Function Key Settings from a Memory Card Saving Function Key Settings to a Memory CardThis page is intentionally left blank How to find fish school center Advanced Level OperationFinding Fish School Center Tracking a fish school Tracking a Fish School target lockChoosing target lock mode Target lock mark appearanceErasing target lock mark Target lock and tilt angle Tracking target lock markSystem Menu Target Lock Setting target lock conditionsDescription of target lock items Detecting Fish Schools Aurally How to set the fish alarm zone Fish AlarmRelocating Fish School for Easy Observation How to relocate fish schoolsEstimate marks and their data Comparing of Fish School ConcentrationMeasuring Fish School Speed How to measure fish speed10 Event marks Event MarkErasing an event mark Entering an event mark12 True motion display True Motion Display13 Net location mark Plotting Net Location Mark14 Net behavior Observing Net BehaviorNo. Display Information Applications Target Slice DisplayThis page is intentionally left blank Port/Starboard display PORT/STARBOARD, Horizontal Slice DisplaysHorizontal slice display Horizontal slice displayInitializing Memory Cards Memory Card OperationsTransferring Echo Data from Internal Memory to Memory Card Saving the PictureTransferring net shooting data to memory card Net shooting data contentsSaving Net Shooting Data How net shooting data is savedReplaying Saved Data Deleting Memory Card ContentsTurning marks on/off through the data setting window Turning MARKS, Data ON/OFFTurning marks on/off through the user menu 10-2 Seabed Echoes Interpreting the DisplaySea surface fish Fish SchoolsWake Sea Surface ReflectionsNoise and Interference False Echo by SidelobeUnretracted Transducer Warning Overvoltage WarningHow to manually raise the transducer Opening the Self Test Menu Self TestsSelf Test Description Single testContinuous test Color test Panel testSIO test Gray testInterface unit CS-120A, cover opened Interface Unit CS-120A Self Test13-6 Selection of Data at Interface Unit CS-120A Input Data SelectionHow to set net sonde transmitter distances Setting Distances Between Net Sonde TransmittersDisplay Unit Maintenance MaintenanceZinc block near the transducer must be replaced yearly Hull Unit MaintenanceUser Menu Menu TreeData SET Menu Init SET/TEST Menu System Menu Previous Page SP-1 SpecificationsSP-2 DisplaySP-3 Hull UnitSP-4 11-2 IndexIN-2