Furuno GP-3500F - Manual (Page 183)

11. VIDEO SOUNDER OPERATION
11-11
Offsetting the basic range
The basic range in the AUTO mode can be offset. This is useful for watching the
bottom in detail.
1. Press the [RANGE] key to show the ECHO SOUNDER RANGE window.
ECHO SOUNDER RANGE
+ 0
Echo sounder range window
2. Rotate the [ENTER] knob to set offset value. (-100 to +300 ft)
Note 1:
This setting must be done within 10 seconds after pressing the [RANGE]
key, otherwise the window will be erased.
Note 2: When the basic range is changed, the offset value returns to zero.
Note 3: The [RANGE] key can be programmed for other function. For details,
see paragraph 11.16.
Offsetting the gain
You can adjust gain in AUTO mode.
1. Press the [GAIN] key to show the GAIN window.
GAIN
+0.0
Gain window
2. Rotate the [ENTER] knob to select offset value. (-5.0 to + 5.0)
Note 1:
This setting must be done within 10 seconds after pressing the [GAIN]
key, otherwise the window will be erased.
Note 2:
The [GAIN] key can be programmed for other function. For details, see
paragraph 11.16.