How To Smooth Echoes (Distance) - Furuno TZT9 Operator's Manual

8. MULTI BEAM SONAR DFF-3D
8.4.4

How to smooth echoes (distance)

If echoes are "disconnected" because of an undulating seabed, change the setting to
[Low], [Medium] or [High] as necessary. Smoothing is done in the range direction to
smooth the echo presentation.
1. Select [Menu] from the menu icon bar to show the menu.
2. Select [Multibeam Sonar].
3. Select [Echo Smoothing (Distance)].
4. Select [Low], [Medium] or [High] as required. The default setting is [Medium]. Se-
lect [OFF] to stop smoothing.
5. Select [Close] to close the pop-up menu.
8.4.5 How to smooth echoes (time)
If echoes are difficult to see because they appear "speckled," use the echo smoothing
feature to suppress the speckling by time.
1. Select [Menu] from the menu icon bar to show the menu.
2. Select [Multibeam Sonar].
3. Select [Echo Smoothing (Time)].
4. Select [Low], [Medium] or [High] as required. The default setting is [Medium]. Se-
lect [OFF] to stop smoothing.
5. Select [Close] to close the pop-up menu.
8.4.6 How to apply correction to the speed of sound
Even though the sea bottom is flat, the left or right edge, up or down may be distorted.
To compensate for this problem, adjust the speed of sound.
Manual correction
1. Select [Menu] from the menu icon to show the menu.
2. Select [Multibeam Sonar].
3. Select [Sound Speed Correction], then enter a correction. The setting range is
-200 to +200.
4. Select [Close] to close the menu.
Automatic correction
1. Select [Menu] from the menu icon to show the menu.
2. Select [Multibeam Sonar].
3. Select [Temp.-based Correction], then select [ON].
Select [OFF] to remove the correction.
4. Select [Close] to close the menu.
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