Furuno NAVNET 1833 - Manual (Page 157)

4. VIDEO SOUNDER OPERATION
4-11
4.5 Measuring Depth, Time
The VRM measures the depth and the cross-hair cursor, time..
1. Rotate the [ENTER] knob to shift the VRM; counterclockwise to shift it
downward, clockwise to shift it upward. You may also use the trackball to
shift the VRM.
2. Roll the trackball horizontally to adjust the time cursor to measure time.
Depth to VRM
Cross-hair
cursor
87
50k
50
0
100
-
-
-
-
-
-
-
-
-
-
28.8
0'33"
Time for a scan line to travel
from the right edge of the
display to the cross-hair cursor
VRM
How to measure depth and time
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.