Furuno GP-1670F Operator's Manual page 96

7. FISH FINDER OPERATIONS
[FISH FINDER SETUP]: The [FISH FINDER SETUP] sub menu provides the following
features.
[TRANSMISSION]
[TRANSMISSION POWER]
[TRANSDUCER]
[TRANSMIT RATE]
[50 kHz ECHO OFFSET],
[200 kHz ECHO OFFSET]
7-20
Item
Turn transmission on or off.
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