4. AIS OPERATION
4-15
4.11 Past Position Display
The past position display shows equally time-spaced dots marking past positions of
activated AIS targets. A new dot is added at preset time intervals until the preset num-
ber is reached. If a target changes its speed, the spacing will be uneven. If it changes
course, its plotted course will not be a straight line.
Below are examples of past position displays.
4.11.1 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] o [30sec] o [1min] o [2min] o [3min] o [6min] o [OFF]...
The past positions are displayed in accordance with the selected setting.
4.11.2 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.
4.11.3 Past position display orientation
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.
(a) Ship turning (b) Ship running straight (c) Ship reduced speed (d) Ship increased speed
OFF
PAST POSN
setting
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