JRC JMA-5212-4, User Manual

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5.6 TRACK DISPLAY
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5.6
TRACK DISPLAY
5.6.1 Display Past Tracks (Past Position)
With the past position function (Past Position), up to 6 past tracked and AIS target positions can be displayed (5
set time and distance intervals).
Select one of the time intervals at which past time positions should be displayed: 0.5 minutes, 1 minute, 2
minutes, and 4 minutes. Also, select one of the distance intervals at which past locations should be displayed:
0.1 NM, 0.2 NM, 0.5 NM, and 1 NM.
Procedure 1 Press the [TT menu] key.
2 Press the following buttons.
3 Target setting
3 Past position
3 Press a number key for the desired setting.
0.5 minutes, 1 minute, 2 minutes, and 4 minutes :
Past positions are displayed at a specified time interval.
0.1 NM, 0.2 NM, 0.5 NM, and 1 NM :
Past locations are displayed at a specified distance interval.
The selected interval will be displayed on the Past position display interval switching
button (Software button
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located at the other ship's information area in Section 2.3.6).
The track display mode is not active when the button shows "Off." Track modes are
linked with vector modes to show a true or relative track. In relative vector mode, the
relative past position of the target is displayed. In true vector mode, the true past position,
which is calculated from the relative bearing/range and the own ship's course/speed, is
displayed.
The past position of a target being tracked is stored from when the target is acquired.
The past position of an AIS target is stored from when the target is activated.
If the past position plotted time is short, the indicated past position duration may not have
achieved the specified time or range.