Measuring Depth, Time; Reducing Interference - Furuno 1824C-BB Operator's Manual

4.4

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.
4.5

Reducing Interference

Interference from other acoustic equipment operating nearby or other electronic equipment
on your boat may show itself on the display as shown below.
To reduce interference, do the following:
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
Interference from
other sounder
Types of interference
4. VIDEO SOUNDER OPERATION
0
VRM (white)
50
100
150
200
Electrical inteference
4-9