Interpreting the Display, Seabed Echoes | Furuno CSH-53 instruction

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 81

Furuno CSH-53 manual Interpreting the Display, Seabed Echoes

Contents

Color Scanning Sonar 00080807301 Safety Instructions Table of Contents Iii Self Tests Foreword System Configuration Control Description Main panel control description Main Panel Control Function END Sub Panel Sub Panel 2 data setting window Main Setting Description Normal Main Setting Description Normal Sub Range + + Remote Control Box Adjusting Screen Brilliance, Control Panel Backlighting Turning the Power On/OffOperational Overview Lowering the Transducer Display mode description Selecting a Display Mode Setting the Tilt Angle Selecting a Display RangeSeabed echo and tilt angle 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 Gain This page is intentionally left blank Fine Tuning the Picture How to adjust TVGEliminating Unwanted Feeble Echoes Page Pulselength data setting window TVG TX, PL AGC data setting window SIGNAL, Signal2AGC data setting window SIGNAL, Signal Process Suppressing Seabed Tail Data setting window TVGTX, Output Rejecting Sonar Interference and NoiseIdentifying noise source Cycle Changing Tx cycle data setting window Tvgtx Noise limiter data setting window SIGNAL, Signal Process Setting F-shift data setting window Sonrbeam Marks, Data and Display Mode Normal display modeMarks and Data Echo sounder combination display Normal display mode w/text History display Permanently Displayed Marks and Data Erasable Marks and Data Bearing marker Range marker Mark Description Range R Auto Tilt ± Auto Scan ± Gain Brill TVG TVG DIM This page is intentionally left blank User Menu Operation Menu Overview User Menu Hist DSP/GRPH Menu screen location and display mode User menu description User Menu Description Current VEC System menu can be displayed by pressing Menu + c System Menu Description Menu Description ES/NET REC Data SET menu can be display by pressing Menu + d Data SET Menu Description Menu NET Shoot Init SET/TEST menu can be displayed by pressing Menu + on Init SET/TEST Menu Description Defaults 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 How to find fish school center Advanced Level OperationFinding Fish School Center Tracking a fish school Tracking a Fish School target lock Choosing target lock mode Target lock mark appearanceErasing target lock mark 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 Reducing Sea Surface Reflections Boosting Tx Power This page is intentionally left blank Port/Starboard display PORT/STARBOARD, Horizontal Slice Displays Horizontal slice display Horizontal slice display Initializing Memory Cards SAVING, Replaying Picture Transferring Echo Data from Internal Memory to Memory Card Saving the Picture Saving Net Shooting Data Net shooting data contentsHow net shooting data is saved Transferring net shooting data to memory card Replaying Saved Data Deleting Memory Card Contents Turning 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 Display Midwater, bottom fish Tilt angle 30 or more Fish Schools Wake Sea Surface Reflections Noise and Interference False Echo by Sidelobe Unretracted Transducer Warning Overvoltage Warning Raise/Lower Control Box of the Hull Unit Self Tests Self Test Description Single testContinuous test Color test Panel test SIO test Gray test Interface unit CS-120A, cover opened Interface Unit CS-120A Self Test This page is intentionally left blank Selection of Data on Interface Unit CS-120A Input Data Selection How to set net sonde transmitter distances Setting Distances Between Net Sonde Transmitters Maintenance Zinc block near the transducer must be replaced yearly Hull Unit Maintenance Replacement of Fuse, Memory Card Battery 15-4 User Menu Menu Tree Data SET Menu Init SET/TEST Menu System Menu Previous This page is intentionally left blank General Specifications Display Environmental Condition 12-7 Index