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Furuno CSH-84, CSH-83 manual Interpreting the Display, Seabed Echoes

Models: CSH-84 CSH-83

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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 11-1 Seabed echoes

11-1

Image 83

Furuno CSH-84, CSH-83 manual Interpreting the Display, Seabed Echoes

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 Word to CSH-83/84 Owners FeaturesForeword 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 ModeSeabed echo and tilt angle Setting the Tilt AngleSelecting a Display Range 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 Eliminating Unwanted Feeble Echoes Fine Tuning the PictureHow to adjust TVG Page Suppressing Seabed Tail AGC data setting window SIGNAL, SignalPulselength data setting window TVGTX,PL 2AGC data setting window SIGNAL, Signal ProcessIdentifying noise source Data setting window TVGTX, OutputRejecting Sonar Interference and Noise Cycle Changing Tx cycle data setting window TvgtxSetting Noise limiter data setting window Signal Adjusting BeamwidthMarks and Data Marks, Data and Display ModeNormal display mode 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 Finding Fish School Center How to find fish school centerAdvanced Level Operation Tracking a fish school Tracking a Fish School target lockErasing target lock mark Choosing target lock modeTarget lock mark appearance 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 user menu Turning marks on/off through the data setting windowTurning MARKS, Data ON/OFF 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 TestsContinuous test Self Test DescriptionSingle 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