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Types and Definitions of AIS 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 COG.
Activated target
The heading direction is displayed with a
solid line, and the COG 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.
Numeric-displayed target
This symbols is displayed around the target
for which numeric data is displayed.
Dangerous target
Alarm characters (CPA/TCPA)
An alarm sounds.
The characters are displayed in red and the
symbol is blinks.
Lost target
The dangerous target is regarded as a lost
target when data cannot be received for
specified time. When it is determined as a lost
target, this symbol is displayed at the position
calculated from the last-received data such as
the course and speed.
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