Furuno GP-1850WF - Manual (Page 22)

2. VIDEO SOUNDER OPERATION
2-6
Selecting display range
Press the RANGE soft key to show the
range window, and select range by the
cursor. Press the RETURN soft key to finish.
RANGE
▲
15 ft
30 ft
60 ft
120 ft
200 ft
400 ft
1000 ft
4000 ft
▼
Range window
Adjusting the gain
Press the GAIN soft key to show the gain
window, and press ▲ or ▼ to set the gain.
Current level is shown above the bar. Press
the RETURN soft key to finish.
GAIN
57 ▲
HIGH
LOW
▼
Gain window
Note:
On the dual-frequency display, the
gain can be independently set for 50
kHz and 200 kHz. This can be done
with the GAIN 50 kHz and GAIN 200
kHz soft keys.
Normally, set the gain to the point where
excessive noise does not appear on screen.
Use a higher gain setting for greater depths
and a lower setting for shallow waters.
Gain too high Gain proper Gain too low
Examples of proper and improper gain
Range shifting
The basic range may be shifted up or down
as desired.
Press the SHIFT soft key, and press ▲ or ▼
to shift the basic range. Press the RETURN
soft key to finish.
Display
Shift
Shift concept