Japan Radio Co. JMR-611, Instruction Manual

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3.5.5 Move Own Ship’s Display Position [OFF CENT]
The own ship’s position can be moved from the display center to stern or bow direction.
Procedures 1 Press [OFF CENT] key.
The display at the lower right of the screen (Fig.2.3- ն ) will be changed.
The own ship’s position will be moved from the display center as following each time the
[OFF CENT] key is pressed:
3.5.6 Display Other Ships’ Trails [TRAILS]
Other ships’ movements and speeds can be monitored from the lengths and directions of their trails, serving for
collision avoidance.
Procedures 1 Put the cursor on TRAILS at the lower left of the screen and press
[ENTER] key .
Trails length will be changed as following sequence .
Trails length will be switched as following each time
TRAILS is pressed.
OFF 2Scan 15sec 30sec 1min 2min 3min
4min 5min 6min OFF
Erasing Trails Data
Procedures 1 Put the cursor on TRAILS and hold down more than 2seconds.
All the stored trails data will be erased.
Trails Motion Mode
There are two types of trails: relative motion trails and true motion trails.
Relative motion trails: The system plots the trails of a target at a position relative to the own ship.
The operator can easily judge whether the target is approaching the own
ship.
While the own ship is moving, the system also plots the trails of land and
other fixed targets.
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.
NOTE :
Accurate true bearing signals and speed signals are necessary for using the true
motion trails mode.
60% of display radius
in the stern direction 40% of display radius
in the stern direction
On center
20% of display radius
in the stern direction
center 1
center 2
off
center 3