User's Manual

JMA-9172-SA Instruction Manual > 3.BASIC OPERATION > 3.4 GENERAL RADAR OPERATION
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3.4.8.3 Trails Motion Mode
There are two types of trails: relative motion trails and true motion trails.
Trails modes provided with this system vary depending on the motion mode.
While the true motion trails mode is active, this system enables the continuous use of true
motion trails even if any of the following operations is performed:
• Motion display mode change (TM/RM)
• TM reset
• Bearing display mode change
• Center move (Off Center)
• MAP display on/off (Map)
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.
With true motion (TM)
mode:
Only the true motion trails mode is available.
With relative motion
(RM) mode:
The relative motion trails mode or true motion trails
mode isselectable.
is indicated while the relative motion
trails mode is active.
is indicated while the true motion trails
mode is active.
i
Accurate true bearing signals and speed signals are necessary
for using the true motion trails mode.
True Motion Trails
HL
Land
Relative Motion Trails
HL
Ship
Trails
Trails
RM(R)
RM(T)