2. TARGET TRACKING (TT)
2-11
2.10.2
Vector mode and length
Vectors may be displayed in true or relative mode. Vector time (or the length of vec-
tors) can be set from 30 sec, 1 to 6 minutes.
1. Open [MAIN MENU], click [TT
.
AIS].
2. Click [VECTOR].
3. Click [VECTOR MODE].
4. Click the appropriate mode.
[VECTOR REL]: Relative mode
[VECTOR T-G], [VECTOR T-S]: True mode
5. Click [VECTOR TIME].
6. Select the time (30 sec to 6 min) with the setting knob.
7. Click outside the menu window to close the menu.
2.11
Past Position Display
Equally time-spaced dots shows the past position display 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] menu. See section 1.25 for the procedure.
2.11.1
How to select the dot number and interval of the past position
You may select the number of past points to display per plotting interval as follows.
1. Open [MAIN MENU], click [TT
.
AIS].
[VECTOR]
1 BACK
2 VECTOR
MODE
VECTOR REL/VECTOR T-G*
3 VECTOR
TIME
30sec
*: For SOG, [VECTOR T-G]
For STW, [VECTOR T-S]
(a) Ship turning
(b) Ship running
straight
(c) Ship reduced
speed
(d) Ship increased
speed
