Furuno FSV-35, Operator'S Manual

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3. VERTICAL MODE
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3.9.5 Reverberation
You may select the length of reverberation for the echo signal, with [Reverberation] in
the [TX/RX Setting] menu on the [V] tab. The larger the setting, the lower the rever-
beration effect, which makes it easier to see the echo signal. The setting range is 0 to
5.
3.9.6 Echo average
[Echo Average] on the [Picture Setting] menu in the [V] tab adjusts echo afterglow -
the amount of time an echo signal remains on the screen. This feature can be useful
for watching echo movement. The setting range is 0 to 11.
Setting between 1 and 7 :
Echoes are gradually displayed and afterglow remains on the screen longer as the
setting is increased.
Setting between 8 and 11 : Echoes are quickly displayed and af-
terglow remains on the screen longer as the setting is increased.
3.9.7 How to suppress the bottom echo
[Bottom Suppress] on the [TX/RX Setting] menu in the [V] tab suppress the stable ech-
oes such as bottom echo, plankton echo. Moving echoes such as fish school are not
effected by this setting. The setting range is 0 to 10. The higher the setting, the lower
the stable echo.
Note: Do not over suppress the bottom echo; a slow moving school of fish may also
be suppressed.