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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 300 targets can be displayed in total of activated and sleeping AIS targets. Up to 100 activated AIS
targets can be included in the total.
If there are more AIS targets than the allowable maximum, they are displayed in the following priority order:
1. Numeric displayed target
2. Target of which CPA / TCPA is lower than the set value
(Target as a dangerous ship for which an alarm has occurred)
3. Target in automatic activation zone
4. Activated AIS target
5. Target inside AIS filter
6. Target outside AIS filter
If the number of targets at the same priority level exceeds the allowable maximum, they are displayed in the
following priority order:
1. Association target
2. Activated AIS target
3. Sleeping AIS target
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