Furuno NAVNET 1752C - Manual (Page 157)

4. VIDEO SOUNDER OPERATION
4-11
4.5 Measuring Depth, Time
The VRM functions to measure the depth, and the time cursor measures time.
1. Rotate the [ENTER] knob to shift the VRM; counterclockwise the shift it
downward, clockwise to shift it upward. You may also use the cursor pad to
shift the VRM, in which case use ▲ or ▼.
2. Use ◄ or ► on the cursor pad to shift the cross-hair cursor to measure the
elapsed time.
Depth to VRM
Cross-hair
cursor
84
LF
50
0
100
-
-
-
-
-
-
-
-
-
-
28.8
0'33"
Time to cursor intersection
(Max. 99'59")
VRM
How to use the VRM, time cursor
Note: If, when the range setting is over 1000 ft (m, fa, p/b), the VRM indication
and depth scale may overlap one another, shift the cross-hair cursor
slightly to show them completely. Further, when the display is shifted, the
depth scale may obscure the time indication.