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18-1
18. TT AND AIS DISPLAYS
Tracked targets and AIS targets can be overlaid on the chart. Only the differences be-
tween the radar and chart TT and AIS displays are described here.
The data of received radar-tracked targets must have reference to ground. If the data
does not meet that criteria, target vectors are not shown and the indications COG and
SOG in the TT info data box show [missing].
18.1 TT Display
18.1.1 TT symbols
Symbol
Default color Name
Description
Green
Green
Green
Red
Green
Green
Red
Red
Past position point
Target under manual
acquisition
Target under automatic
acquisition
Acquired target
Acquired target in ACQ
zone (before ACK)
Dangerous target
Reference target
Lost target
Marks a past position of a TT.
A target acquired manually is initially
indicated with a dashed circle.
A target acquired automatically is initially
indicated with a thick, dashed circle.
Solid circle with vector indicating steady state
tracking (within three minutes after acquisition)
Solid circle with vector indicating steady state
tracking (within three minutes after acquisition)
Dangerous TT (thick, solid circle)
Used to calculate own ship’s over-the-ground
speed (echo-referenced speed) for ground
stabilization.
Green
Target selected Target selected to show its data.
Marks a lost target.
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