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3. TARGET TRACKING (TT)
3-12
Relative vector
Relative vectors on targets that are not moving over the ground such as land, naviga-
tional marks and ships at anchor will represent the reciprocal of own ship's ground
track. A target whose vector passes through own ship is on a collision course. (Dotted
lines in the figure are for explanation only.)
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 in one-minute intervals, from 1 - 60 minutes.
Buoy
Own Ship
True vectors in ground
stabilization
AIS
Buoy
Own Ship
True vectors in sea
stabilization
TT
AIS
TT
Buoy
Own Ship
Relative vectors
AIS
TT
Current
(Set and drift)
Vector length
Vector motion