5.6 TRACK FUNCTION
5.6.1 Past Position (Past POSN)
Procedures 1 Put the cursor on the past position display interval unit switching
(TT/AIS information ⑦ on page 2-23), and press the [ENT] key to set
a desired unit.
The past position display interval unit will be set to min or NM .
2 Put the cursor on the past position display interval switching (TT/AIS
information ⑥ on page 2-23), and press the [ENT] key to set a desired
track display interval.
The past position will be set.
Off :Tracks are not displayed.
Numeric :Tracks are displayed at intervals of a specified value.
The past position function can display up to 10 past positions of a target under tracking. The past position
display interval can be set to specified time intervals of 0.5, 1, 2, or 4 minutes, or specified range intervals
of 0.1, 0.2, 0.5, or 1 nm.
The specified interval is displayed in the past position display interval switching (TT / AIS information ⑥
on page 2-23). When Off is displayed, the track display function is turned off.
The track mode operates in conjunction with the vector mode, and a true or relative track is displayed.
In relative vector mode, the relative tracks of the target are displayed.
In true vector mode, true tracks that are calculated from the relative bearing, range, own ship's course, and
speed are displayed.
The target is acquisition, past position of traced target is start plot.
The AIS target is displayed, past position of AIS target is start plot.
If the past position plotted time is short, the indicated past position duration may not have achieved the
specified time or range.
5-49
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