Switching True/Relative Motion Display [Tm; Switching The Motion Mode; Resetting Own Ship's Position In True Motion Display - JRC JMA-5104 Instruction Manual

3.5.14 Switching true/relative motion display [TM/RM]
The motion mode determines whether to display the moving of the own ship and another target in
relative motion or true motion.

1. Switching the motion mode

(a) Press the [TM/RM] key.
sequence:
"RM" "RM" "RM" "RM" → "TM" "TM" "TM" → "CTM" "TM"
RM: Relative motion. This mode displays other targets in relative motion fixing the own
ship to the center.
Radar trails are displayed in relative motion.
TM: True motion. This mode displays the own ship and other targets in true motion on the
screen with the earth being fixed.
Radar trails are displayed in true motion.
CTM: True motion with own ship fixed. This mode displays other targets in relative motion
fixing the own ship to the center.
Radar trails are displayed in relative motion.
"True motion display TM"
The fixed position of own ship on the screen moves according to the ship speed and course. A
fixed target like a land target is fixed onto the screen, and an actually moving target moves on
the screen. The position of own ship is set to a position about 66% of the radius in the opposite
direction of the course on the extension of the ship's heading marker (SHM) when the true
motion display is enabled. The ship starts moving from the position according to the specified
own ship's speed and course.
After that, when the own ship reaches a position 66% of the radius in the opposite direction,
the own ship's position is automatically reset to the position at switching to the true motion
display.
2. Resetting own ship's position in true motion display (TM)
Reset method :
Hold down the [TM/RM] key.
The screen display and function changes in the following
"CTM" → "RM" "CTM" "CTM" "RM" "RM" "RM"
True motion display
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