8. MULTI BEAM SONAR DFF-3D
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How to restore default view
If you get lost in viewpoint or zoom, you can restore the default view as follows.
1. Tap the 3D sounder history display to show the pop-up menu.
2. Select [Default View].
8.6.3 How to mark school of fish
A detected school of fish can be marked with a "dot" mark for
easy identification.
1. Tap the 3D sounder history display to show the pop-up
menu.
2. Select [Fish School Icon] to mark the detected school of fish with the dot mark.
8.6.4 How to stop advancement of the display
You can stop advancement of the history display to observe the distribution of sea
floor topography and school of fish.
1. Tap the 3D sounder history display to show the pop-up menu.
2. Select [Pause] to stop the display.
8.6.5 How to adjust the echo detection level
Adjust the echo detection level if schools of fish are detected unstably.
1. Select [Settings] on the home screen.
2. Select [Multibeam Sonar] - [3D Sounder History].
3. Select [Fish Detection Level].
4. Select [Low], [Medium] or [High] as required. The default setting is [Medium]. If too
many schools of fish are being detected, select [Low]. If too few schools are de-
tected, select [High].
5. Select [Close] to close the menu.
8.6.6 How to calibrate the seabed echo
If schools of fish or a fish reef are detected and displayed as the seabed echo, adjust
the strength of the seabed echo as shown below to correctly identify the seabed echo.
1. Select [Settings] on the home screen.
2. Select [Multibeam Sonar] - [3D Sounder History].
3. Select [Seabed Echo Calibration]. Drag the slider bar to adjust.
The setting range is -15 to +15. A large figure helps distinguish bottom fish from
the seabed echo; however, it is difficult to distinguish a fish bed. Use a small figure
to distinguish a fish bed; however, it is difficult to distinguish bottom fish from the
seabed echo.
4. Select [Close] to close the menu.
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