3. TARGET TRACKING (TT)
3-12
3.11.2 How to change the vector length (time)
The vector time provides an estimation of the target’s vector and can be adjusted as
follows:
Place the cursor on the vector time indication in the [Vector] box, then press the left
button. The vector time cycles through the following settings with each press of the
left button.
[6min] o [10min] o [20min] o [30min] o [45min] o [60min] o [30sec] o [1min] o
[3min] o [5min] o [6min]...
The vector tip shows an estimated position of the target after the selected vector time
elapses. It can be valuable to extend the vector length to evaluate the risk of collision
with any target.
3.12 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 paragraph 1.36.1.
3.12.1 How to display past position points and select the past posi-
tion plotting interval
Place the cursor on the [PAST POSN] time indication in the [PAST POSN] box, then
press the left button. The past position points are displayed and their plotting interval
changes with each press of the left button, as shown below.
[OFF] o [30sec] o [1min] o [2min] o [3min] o [6min] o [OFF]...
3.12.2 How to select the number of past position points to be dis-
played
1. Open the [MAIN MENU].
2. Select [TT•AIS], then push the ADJUST knob.
3. Select [TT•AIS SYMBOL], then push the ADJUST knob.
4. Select [TT•AIS PAST POSN POINTS], then push the ADJUST knob.
5. Select [5] or [10] as appropriate, then press the ADJUST knob.
6. Close the menu.
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