Furuno GP-3500F - Manual (Page 188)

11. VIDEO SOUNDER OPERATION
11-16
11.5 Measuring Depth, Time
The VRM measures the depth, and the time marker measures time.
● For measuring depth, roll the trackball in upward-downward direction to shift
the VRM.
● For measuring time, roll the trackball in left-right direction to move the time
marker to measure the elapsed time.
AUTO C
58.6
m
17.6
0
20
40
60
80
5.6 °
C 10.0 kt
1'50"
50k
Minute and seconds
of time marker
VRM
Depth of VRM
Time marker
How to use the VRM, time cursor
To measure depth or time in the plotter (pilot)/sounder display, follow the
procedure below. Further, you may mark the geographical location of a fish
school on the plotter display.
a) Press the [CURSOR ON/OFF] key more than three seconds to enable
trackball operation on the sounder display. At this time the track cursor
appears on the ship’s track line and it denotes the approximate
geographical position of the time marker on the sounder screen.