Furuno FCV-1100L - Manual (Page 21)

1. OPERATIONAL OVERVIEW
1-13
1.8 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
1.9 Measuring Depth
Use the [ ▲ ] or [ ▼ ] key to place the VRM on the object to measure depth. Depth
is digitally displayed above the VRM.
Note: This operation is available by setting MARKER SELECT on the DISP
menu to “VRM.”
1/1 0
20
40
60
80
0
49.6
m
39.8
Depth to VRM
VRM (green)
LF
How to use the VRM