Furuno 1934C-BB manual Measuring Depth, Time, Reducing Interference, How to measure depth and time

4. VIDEO SOUNDER OPERATION

4.4Measuring 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.

4.5Reducing Interference

Interference from other acoustic equipment operating nearby or other electronic equipment on your boat may show itself on the display as shown below.

Interference from	Electrical inteference
other sounder

Types of interference

To reduce interference, do the following:

4-9