JRC JMA-3300 Series, Instruction Manual, Page: 78 / 298

Chapter 2 OPERATIONS
2.7 SOFT KEY OPERATION
2-32
2.7.5
DISPLAYING OTHER SHIP'S TRACKS (RADAR
TRAILS)
Sets radar trails.
Other ships' movements and speeds can be monitored from the lengths and directions of
their trails, serving for collision avoidance.
1
Select RADAR Trails on the soft key menu.
The soft key menu disappears and "Trails" of the soft key display is color-inverted.
"RADAR Trails" is activated.
2
Operate with the soft keys.
Soft key 1: REF Level1 REF Level2 REF Level3 REF Level4
Selects a radar video level required for plotting radar trails.
"REF Level1" is the lowest level while "REF Level4" is the highest level.
y When radar trails are plotted with unwanted waves, change to a higher level.
y To thin radar trails, change to a higher level.
y If radar trails are plotted in snatches, change to a lower level.
Soft key 2: Time/Cont Off Time/Cont On
This function superimpose-displays time radar trails and continuous radar trails.
When "Time/Cont Off" is selected, this superimpose-display is disabled.
When "Time/Cont On" is selected, this superimpose-display is enabled.
Soft key 3: True Relative
Switches the radar trail display between true and relative motion trail modes.
True motion trails:
The system plots the absolute motion trails of a target, irrespective of
the own ship’s position.
The operator can easily judge the course and speed of the target.
The system does not plot the trails of land and other fixed targets.
Select "RADAR Trails" and press the control.