Furuno 1833C Manuel D’Utilisation
4. VIDEO SOUNDER OPERATION
4-12
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
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.
shift the VRM.
2. Roll the trackball horizontally to adjust the cross-hair cursor to measure time.
VRM (white)
40.0
Depth to VRM
Cross-hair
cursor
cursor
50k
97
150
200
50
100
0
0'33"
Time for a scan line to travel
from the right edge of the
display to the cross-hair cursor
from the right edge of the
display to the cross-hair cursor
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.
slightly to show them completely. Further, when the display is shifted, the
depth scale may obscure the time indication.