Measuring Depth, Time - Furuno 1823C Operator's Manual

4. VIDEO SOUNDER OPERATION
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 cross-hair cursor to measure 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.
4-12
Depth to VRM
Time for a scan line to travel
from the right edge of the
display to the cross-hair cursor
0'33"
40.0
Cross-hair
cursor
97
LF
How to measure depth and time
0
VRM (white)
50
100
150
200