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

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 Configuration Control Description Control Layout on Display Unit and Remote Control Box Main panel control description Main Panel Control Function END Sub Panel Sub Panel 2 data setting window 2AGC SignalAGC Process Sonrbeam AlarmSonar UP/TM + + Remote Control Box Lowering the Transducer Turning the Power On/OffAdjusting Screen Brilliance, Control Panel Backlighting Operational Overview Display mode description Selecting a Display Mode Seabed echo and tilt angle Setting the Tilt AngleSelecting a Display Range Points to consider How to discriminate fish echoes from the seabed Tilt angle and sea surface reflections Tilt angle for surface fish Tilt angle and beam coverage Suitable tilt angle Measuring 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 Process Identifying noise source Data setting window TVGTX, OutputRejecting Sonar Interference and Noise Cycle Changing Tx cycle data setting window Tvgtx Setting Noise limiter data setting window Signal Adjusting Beamwidth Marks and Data Marks, Data and Display ModeNormal display mode Echo sounder combination display Normal display mode w/text History display Permanently Displayed Marks and Data Mark/Data Description Erasable Marks and Data Bearing marker Mark Description Range R Auto Tilt Auto Scan Gain Brill TVG TVG DIM Page User Menu Operation Menu Overview User Menu Hist DSP/GRPH Menu screen location and display mode User Menu Description Save Picture Current VEC Target Lock System Menu DescriptionFAR TVG TM DSP Mark Size BRG Readout Menu Description Color Curve Data SET Menu Description Change Color NET Plot Corr NET ShootPlan NET Sonde Init SET/TEST Menu Description Others Event KEY DefaultsEcho Test NET REC Programming the Function Keys Function Keys Replaying a Function Key Function Key Fine Tuning Replaying Function Key Settings from a Memory Card Saving Function Key Settings to a Memory Card This 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 lock Erasing target lock mark Choosing target lock modeTarget lock mark appearance Target lock and tilt angle Tracking target lock mark System Menu Target Lock Setting target lock conditions Description of target lock items Detecting Fish Schools Aurally How to set the fish alarm zone Fish Alarm Relocating Fish School for Easy Observation How to relocate fish schools Estimate marks and their data Comparing of Fish School Concentration Measuring Fish School Speed How to measure fish speed 10 Event marks Event Mark Erasing an event mark Entering an event mark 12 True motion display True Motion Display 13 Net location mark Plotting Net Location Mark 14 Net behavior Observing Net Behavior No. Display Information Applications Target Slice Display This page is intentionally left blank Port/Starboard display PORT/STARBOARD, Horizontal Slice Displays Horizontal slice display Horizontal slice display Initializing Memory Cards Memory Card Operations Transferring Echo Data from Internal Memory to Memory Card Saving the Picture Transferring net shooting data to memory card Net shooting data contentsSaving Net Shooting Data How net shooting data is saved Replaying Saved Data Deleting Memory Card Contents Turning 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 Display Sea surface fish Fish Schools Wake Sea Surface Reflections Noise and Interference False Echo by Sidelobe Unretracted Transducer Warning Overvoltage Warning How to manually raise the transducer Opening the Self Test Menu Self Tests Continuous test Self Test DescriptionSingle test Color test Panel test SIO test Gray test Interface unit CS-120A, cover opened Interface Unit CS-120A Self Test 13-6 Selection of Data at Interface Unit CS-120A Input Data Selection How to set net sonde transmitter distances Setting Distances Between Net Sonde Transmitters Display Unit Maintenance Maintenance Zinc block near the transducer must be replaced yearly Hull Unit Maintenance User Menu Menu Tree Data SET Menu Init SET/TEST Menu System Menu Previous Page SP-1 Specifications SP-2 Display SP-3 Hull Unit SP-4 11-2 Index IN-2