Furuno FCV-1150 Operator's Manual page 44

2. SYSTEM MENU
[HF], [LF]
Draft: The default depth display shows the
distance from the transducer. If you would
rather show the distance from the sea sur-
face, set your ship's draft.
Gain ADJ: If the gain is too high or too low, or
there is a difference in the gain between the
low and high frequencies, you can compen-
sate for it here.
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