Furuno CSH-23F/24F manual Interpreting the Display, Seabed Echoes

Page 87

INTERPRETING THE DISPLAY

Seabed Echoes

When the tilt angle is widened, the seabed echo illustrated be- low will appear on the display. When the tilt is narrowed, the seabed trace becomes wider and weaker. By observing the sea- bed condition on the display, the skipper can prevent net dam- age.

(A)Flat seabed

Tilt angle: 10° to 15°

(B)Flat seabed

Tilt angle: 20° or more

(C)Sloping seabed

Tilt angle: 20° or more

Narrow tilt angle Only half of vertical beam width captures the seabed.

Seabed is displayed narrower and in stronger colors when compared to (A).

Shallow bottom is displayed in a strong color and with a short tail.

Seabed

The deeper seabed echo is displayed in a weak color and with a long tail.

Figure 12-1 Seabed echoes

12-1

Image 87

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 Features ForewordWord to CSH-23F/24F Owners Standard Option System ConfigurationControl Description Control Layout on Display Unit and Remote Control BoxMain panel control description Main PanelGain NORM, E/S, HistRECALL, Memo RangeControl Function 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 OverviewSelecting a Display Mode ModeDescription Setting 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 TvgtxMenu Application Adjusting BeamwidthSetting F-shift data setting window Sonrbeam Noise limiter data setting window SIGNAL, SignalMarks, Data and Display Mode Normal display modeMarks and Data Echo sounder combination display Normal display mode w/textPermanently Displayed Marks and Data History displayMark/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 How to open Menu OverviewUser Menu Operation User Menu Hist DSP/GRPH Menu screen location and display modeMenu Menu Item Description User Menu DescriptionSave Picture Current VECSystem Menu Description FAR TVGTM DSP BRG Readout Data DisplayMark Size Interlock DefaultsES/NET REC Hist DisplayColor Curve Data SET Menu DescriptionChange Color NET Plot Corr NET ShootPlan NET SondeInit SET/TEST Menu Description Echo Test Menu DescriptionProgramming 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 Finding Fish School Center Advanced Level OperationTracking 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 Vertical Scanning Display Using Vertical Scanning DisplayApplication to Bonito and Tuna Fishing Display IndicationsSearching Approaching TrackingCatching CatchingPort/Starboard display PORT/STARBOARD, Horizontal Slice DisplaysHorizontal slice display Horizontal slice displayInitializing Memory Cards Memory Card OperationsSaving the Picture Transferring Echo Data from Internal Memory to Memory CardData to Save Saving Method Saving to Transferring 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 This page is intentionally left blank Seabed Echoes Interpreting the DisplayMidwater, bottom fish Tilt angle 30 or more 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 TestThis page is intentionally left blank 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 This page is intentionally left blank SP-1 SpecificationsSP-2 DisplaySP-3 Hull UnitThis page is intentionally left blank 12-2 IndexIN-2