8. MULTI BEAM SONAR DFF-3D
8-11
8.5.3 Zoom display
The seabed echo can be zoomed.
1. Open the Layers menu.
2. Select [ON] (zoom display) or [OFF] (normal display) for [Zoom].
8.5.4 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. Open the [Cross Section] menu.
2. Tap [Echo Smoothing (Distance)].
3. Select [Low], [Medium] or [High]. The default setting is [Medium]. Select [Off] to
stop smoothing.
4. Tap the close button on the title bar to finish.
8.5.5 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. Open the [Cross Section] menu.
2. Tap [Echo Smoothing (Time)].
3. Select [Low], [Medium] or [High]. The default setting is [Medium]. Select [Off] to
stop smoothing.
4. Tap the close button on the title bar to finish.
8.5.6 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. Open the [Cross Section] menu.
2. Set the correction with the software keyboard or slider bar at [Sound Speed Cor-
rection]. The setting range is -200 to 200.
3. Tap the close button on the title bar to finish.
[Zoom] selected
[Zoom] not selected
m
15.3 °C
Gain Auto F
165 kHz
m
15.3 °C
Gain Auto F
165 kHz
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