Furuno FCV-1200LM - Manual (Page 23)

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1.7 Adjusting Gain
The [GAIN] control adjusts the sensitivity of the receiver. Adjust it so excessive noise just
disappears from the screen.
Gain too high Gain proper Gain too low
Examples of proper and improper gain levels
1.8 Measuring Depth
Use [!] or ["] key to place the VRM on the object to measure depth. Depth is digitally
displayed above the VRM.
Note: This operation is not available when the white marker window appears (by pressing the
[!] or ["] key). Select VRM at MARKER SELECT in DISP menu to use the VRM.
LF
49.6
1/1
ft
0.0
20
40
60
80
0
0
39.8
Depth to VRM
VRM (Green)
How to use the VRM