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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 (S T) to shift the
VRM.
2. Press the cursor pad (W X) to adjust the time marker to measure time.
How to measure depth and 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