Furuno CH-250 manual Port-starboard picture bottom, When ship passes over fish schools

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3.13.2 Sample echo displays

Port-starboard picture (bottom)

You can see fish echoes at the center-right of the screen. The bottom is displayed wider as the distance from the ship’s position increases. Therefore, it may be difficult to discriminate bottom fish.

Own ship

PORTSTBD

Fish

school

Bottom

Figure 3-18 Port-starboard picture

When ship passes over fish schools

The sounding beam is directed fore-aft and the display is off-centered* to present a wider view of the area forward of the ship. You can clearly see fish schools approaching from the bow of the ship.

*: Automatically shifted.

Forward

FORE

Fish school

Own ship

AFT

FORE AFT Fish

school

Figure 3-19 Picture appearance when passing over fish schools

3-14

Image 64

Contents Color LCD Searchlight Sonar 00080894802 Safety Instructions TFT LCD Table of Contents Menu Operation Features ForewordUsage Precautions System Configuration Viii Operational Overview Control DescriptionRemote Controller Remote controllerPower on Turning the Power On/OffPower off Lowering the transducer Raising, Lowering the TransducerRaising the transducer Adjusting Screen Brilliance, Panel Dimmer Brilliance, panel dimmer dialog boxSelecting a Display Horizontal Expanded HorizontalAdjusting the Gain Basic Menu OperationDialog box for deleting track Horizontal Mode Operational OverviewTypical Horizontal Mode Display ColorSelecting the Range Selecting Sector Width One-touch selection of 360 sectorSelecting Train Center Selecting the Tilt AngleHow to discriminate fish echoes from the bottom Bottom echo and tilt angleCase1 Tilt angle 30 to Case2 Tilt angle 10 toTilt angle for surface fish Points to considerSuitable tilt angle Tilt angle and beam coverageSelecting the Training Speed Finding Echo Position with the CursorEvent Marker Inscribing the event markerDepth and Horizontal Range Markers Deleting all event markersAdjusting the Picture Suppressing bottom and surface reflectionsSuppressing bottom tail Displaying weak echoes clearlyTo adjust TVG Erasing weak echoes Enlarging fish echoes expand horizontal display Train center direction Position after expansion RemarksManual reserve mode Setting target lock modeTarget Lock Position mode To use the position modeEcho mode Automatic echo tracking modeManual echo tracking mode Horizontal Menu Overview Horizontal menu descriptionLOG How the horizontal mode picture is painted Interpreting the Horizontal DisplaySample echo displays Bottom echoesFish schools BottomSea surface reflections WakeSidelobe echo false echo Noise and interferenceCombination display examples Horizontal/history displayHorizontal/video plotter display 28 Horizontal/Video Plotter displayHorizontal/strata display Press the key to display the horizontal/strata displayColor bar for the strata display Flat bottom and strata displayProjection in fore direction and strata display 31 Projection in fore direction and strata displayVertical FAN Mode Typical Vertical Fan Mode Display AFTRange concept Default vertical fan mode range settings Train indicator Selecting Display Sector One-touch selection of 180 sectorSelecting Sector Center Automatic shifting of own ship positionNAV 11 How to inscribe, delete the event markers 12 Depth and horizontal range markers 13 Vert menu Suppressing noise and interference 14 Examples of proper and improper TVGVertical Menu Overview Vertical menu descriptionHow the vertical fan mode picture is painted Interpreting the Vertical Fan DisplayWhen ship passes over fish schools Port-starboard picture bottomDisplay of net hauling False echoHorizontal/vertical fan display Train controlSector control This page intentionally left blank Echo Sounder Mode Event MenuTypical Echo Sounder Display Press the key to display the echo sounder pictureRange concept Default echo sounder mode range settings Selecting Tilt Angle Train DirectionSelecting Picture Advance Speed How to measure range with the cursor Measuring Range by CursorHow to inscribe, delete the event markers Range Marker Range markerES menu Finding echo strength A-scope display A-scope displayEcho Sounder Menu Overview Echo sounder menu descriptionGeneral use This page intentionally left blank Menu Operation COM1 Menu1 COM1 menu description Displaying the COM2 menu COM2 Menu2 COM2 menu description Short-cut Menu, Preset Menu Selecting short-cut or presetSystem menu Preset key Activating custom modeShort-cut key Activating a short-cut keyVertical Search Function System Setting SYS MenuSystem Setting 1 menu System Setting 1 menu description10 ETA marker System Setting 2 menu description Default Setting YESTransducer being lowered 12 Factory Setting menu Sonar horizontal mode range settings 13 Range-sonar mode menuVertical fan mode range settings 14 Range-ver mode menuEcho sounder mode range settings 15 Range-E/S mode menuTrack range settings 16 Range-track mode menuColor palette 17 Color paletteLoading backup data System backupLanguage Transducer frequency adjustment Demonstration modeRestoring all default settings 23 Default menuPreventive Maintenance MAINTENANCE, TroubleshootingCleaning the Equipment Lubrication Hull Unit MaintenanceManually raising, lowering transducer Transducer Maintenance Fuse ReplacementTroubleshooting Symptom Check, RemedyError Messages Message Meaning, Remedy Hull UnitDiagnostics LED ExitPage Test Pattern Test patternMenu Tree Scope OFF, onFrom Previous Specifications of 10.4 Inch Color LCD Searchlight Sonar Transceiver Unit Interface This page is intentionally left blank Index AGCIN-2

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