Furuno 1823C manual Measuring Depth, Time, How to measure depth and time

4. VIDEO SOUNDER OPERATION

4.5Measuring 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.

Depth to VRM
Time for a scan line to travel
from the right edge of the
display to the cross-hair cursor
0'33"	0
40.0	VRM (white)
	50
Cross-hair
cursor	100
	150
97	200
LF

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.

4-12