Furuno GP-7000F - Manual (Page 98)

10. VIDEO SOUNDER OPERATION
10-12
10.4 Measuring Depth, Time
The VRM measures the depth and the time marker, time.
1. Rotate the [ENTER] knob to shift the VRM; counterclockwise to shift it
upward, clockwise to shift it downward. You may also use the cursor pad
(▲▼) to shift the VRM.
2. Press the cursor pad (◄►) to adjust the time marker to measure time.
VRM (white)
40.0
Depth to VRM
Time marker
50k
97
50
100
0
0'33"
Time for a scan line to travel
from the right edge of the
display to the cross-hair cursor
ft
How to measure depth and time