ņ7
Types and Definitions of AIS Target Symbols
Vector/Symbol Definition Remarks
Sleeping target
This symbol is displayed when received data is valid.
The direction of the triangle’s vertex indicates the target’s
bow or course.
Activated target
The heading direction is displayed with a solid line, and the
course vector is displayed with a dotted line. The line
perpendicular to the heading direction indicates the direction
to which the course is to be changed. This line may not be
displayed.
Target acquired in
automatic acquisition
zone
The alarm sounds.
The alarm message (New Target) turns red and blinks.
Outline display The outlines of ships are displayed scaled down.
Numeric displayed target
When the numeric data is displayed, the target symbol is
enclosed in a square.
Dangerous target
The alarm sounds.
The alarm message (CPA/TCPA) turns red and blinks.
The symbol is turns red, and indicates with X mark.
Lost target
The alarm sounds.
The alarm message (Lost) turns red and blinks.
The symbol is turns red, and indicates with X mark.
Up to a total of 130 activated and sleeping AIS targets can be displayed.
Of which, up to 30 activated AIS targets can be displayed.
If there are more than 130 AIS targets, priority of displaying these targets is as follows:
1. Numeric displayed targets
2. Targets with CPA / TCPA smaller than the set value
(They are considered as dangerous targets and the alarm sounds.)
3. Targets within the automatic activation area
4. Activated AIS targets
5. Targets within the AIS filter (sleeping AIS targets)
If the number of targets exceeds the maximum number of targets that can be displayed within one priority, these
targets are then displayed in accordance with the priority list below:
1. Association targets
2. Activated AIS targets
3. Sleeping AIS targets
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