JRC JMR-7230-S - Types and Definitions of AIS Target Symbols

6-7 Section 6 Target Tracking and AIS
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Memo
When a target acquired from RADAR is displayed on the ECDIS screen, the ID is prefixed by “T1-“ or
“T2-“ (such as “T1-12” and “T2-12”). On the RADAR screen, only the ID is displayed, not the symbol.
Memo
The initial acquisition target is displayed only when TTM sentence is received from RADAR.
6.3.3 Types and Definitions of AIS Target Symbols
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 heading or course.
f
Target in pause state
When CTW/STW of the target cannot be
received, the symbol is displayed in a broken
line.
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.
Activated target
When CTW/STW of the target cannot be
received, the symbol is displayed in a broken
line.
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 enlarged and displayed in red.
Danger target
When CTW/STW of the target cannot be
received, the symbol is displayed in a broken
line.
Lost target
The alarm sounds.
The alarm message (Lost) turns orange and
blinks.
The symbol is displayed by overlaying red x
marks.
AIS122
AIS12
AIS12
AIS12
AIS12
AIS12
AIS12