3. TARGET TRACKING (TT)
3-19
3.13 Past Position Display
The past position display shows equally time-spaced dots marking the past positions
of any targets being tracked.
A new dot is added every minute (or at other preset time intervals) until the preset
number is reached. If a target changes its speed, the spacing will be uneven. If it
changes the course, its plotted course will not be a straight line.
Past position orientation, true or relative, is controlled with [TRAIL MODE] in the
[TRAIL] context menu. To adjust the trail orientation, see section 1.37.1.
3.13.1 How to display past position points and select the plotting in-
terval
Select the [PAST POSN] setting, then left-click to cycle through the following settings.
[OFF] → [30sec] → [1min] → [2min] → [3min] → [6min] → [OFF]...
The on-screen display of past positions changes in accordance with the selected set-
ting.
3.13.2 How to select the number of past position points to be dis-
played
1. Open the menu.
2. Select [5 TT•AIS].
3. Select [4 TT•AIS SYMBOL].
4. Select [5 TT•AIS PAST POSN POINTS].
5. Select [5] or [10] as appropriate.
6. Close the menu.
PAST POSN
setting
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