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3. TARGET TRACKING (TT)
3-13
3.9.2 Vector motion and length
Vectors may be displayed in true or relative motion. Vector time (or the length of vec-
tors) can be set between 30 seconds and 60 minutes.
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.
From the Control Unit
Vector motion: Push the VECTOR MODE key consecutively to select relative or true
vector mode. Your selection is shown in the Vector mode indication.
Vector length: Push the VECTOR TIME key consecutively to select vector time,
among 30 seconds, 1 minute, 3 minutes, 5 minutes, 6 minutes, 10 minutes, 20 min-
utes, 30 minutes, 45 minutes and 60 minutes.
By trackball module
Vector motion: Click the vector motion indication at the right side of the screen to se-
lect relative or true vector mode.
Vector length: Click the vector time indication at the right side of the screen to select
time among 30 seconds, 1 minute, 3 minutes, 5 minutes, 6 minutes, 10 minutes, 20
minutes, 30 minutes, 45 minutes and 60 minutes. Or, spin the scrollwheel to select the
length from 30 seconds or 1 - 60 minutes, in one-minute intervals.
3.10 Past Position Display
The past position display shows equally time-spaced dots marking the past positions
of any targets being tracked.
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. See the illustration below for dot pattern and
ship status.
Vector length
Vector motion
(a) Ship turning (b) Ship running
straight
(c) Ship reduced
speed
(d) Ship increased
speed