How To Measure Depth, Time Between Locations - Furuno GP-3700F Operator's Manual

11. ECHO SOUNDER
11.5

How to Measure Depth, Time Between Locations

You can measure the depth to an object with the VRM. Also, you can measure the time
from the right edge to a location. For example, you can measure how many minutes
ago an echo appeared.
Press the CURSOR ON/OFF key to turn on/off the VRM/time marker.
• Depth: Rotate the trackball in upward-downward direction to shift the VRM.
• Time: Rotate the trackball in left-right direction to move the time marker to measure
the elapsed time.
Time marker
To measure depth or time in the plotter/echo sounder display, follow the procedure be-
low.
1. Long-press the CURSOR ON/OFF key to enable trackball operation on the echo
sounder display. At this time the track cursor (
of the plotter display and it denotes the approximate geographical position of the
time marker.
2. Operate the trackball to place the time marker on the school of fish desired, and
then press the applicable numeric key among 1 to 8 to mark the location of the
school of fish on the plotter display. Also, a vertical line is entered at the time mark-
er position on the echo sounder display. The color of the line is the seventh color
from the top of the color bar in the 64 color display, the top color of the color bar
in the 16 color display. Waypoint can be entered at track cursor position similarly
by pressing the WPT key.
3. Long-press the CURSOR ON/OFF key to erase the track cursor. The trackball op-
eration is available on the plotter display.
11-12
VRM
Upper: Minutes and seconds
of time marker
Lower: Depth of VRM
) appears on the ship's track line