Furuno GP-1670F Operator's Manual page 100

7. FISH FINDER OPERATIONS
[FULL SCREEN GAIN CONTROL]: The gain setting can be applied to only new ech-
oes or new and existing echoes. Turn this feature on to get the gain setting applied to
both new and existing echoes. The advantage of the full screen gain control is that you
can quickly and easily find the right gain setting for your conditions.
[FISH FINDER SETUP]: The [FISH FINDER SETUP] sub menu provides the following
features.
[TRANSMISSION POWER]
[TRANSDUCER]
[TRANSMIT RATE]
[50 kHz ECHO OFFSET],
[200 kHz ECHO OFFSET]
7-20
Item
Set the transmission power, [High] or [Low]. Interfer-
ence may appear on the screen when an echo sounder
having the same frequency as your own is being oper-
ated in the vicinity of your boat. In this case, select low
power and contact the other vessel to request them to re-
duce their TX power.
Select the transducer used. If you use the optional triduc-
er 525STID-MSD or 525STID-PWD, you do not need to
select the transducer.
Change pulse repetition rate. Normally, the highest rate
(20) is used. When in shallow waters second re-flection
echoes may appear between the surface and actual bot-
tom echo. In this case, lower the TX transmit. The [[Au-
to]] setting automatically adjusts the frequency and pulse
length with depth.
The echo offset feature compensates for too weak or too
strong echo level. If the on-screen echo level appears to
be too weak or too strong and the level cannot be adjust-
ed satisfactorily with the gain controls, apply an offset to
correct the level.
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Function