16.8 AIS target symbols
Your multifunction display shows a range of symbols
to represent the different types of AIS target.
Target type
Description
Symbol
Transmitting target
Target is moving or
at anchor (Target
is not activated,
dangerous or lost).
Activated target
Target activated —
that is, AIS vector
displayed. Vector
line (optional)
shows predicted
distance travelled
within a given time.
Selected target
Target selected
with cursor. Can
view detailed data.
Dangerous target
Targets within
specified distance
(CPA) or
time (TCPA).
Dangerous target
alarm sounds if
enabled. Target
red and flashing.
Uncertain target
Calculated CPA
/ TCPA value
uncertain.
Lost target
When the signal of
a dangerous target
not received for 20
seconds. Target
in latest predicted
position. Alarms
sounds if enabled.
Target flashes.
Buddy target
Target has
previously been
added to the
Buddy List.
Aid To Navigation
(AToN) target
(Real)
AToN target is ON
position.
Aid To Navigation
(AToN) target
(Real)
AToN target is OFF
position.
Aid To Navigation
(AToN) target
(Virtual)
AToN target is ON
position.
Aid To Navigation
(AToN) target
(Virtual)
AToN target is OFF
position.
Land base station
target
Land base station
target is ONLINE.
Target type
Description
Symbol
Search and rescue
transponders
(SARTS) target
SARTS target
Search and rescue
aircraft (SARS)
target
SARS target
Military and law
enforcement target
Only displayed
when connected
to approved
STEDS-EAIS AIS
hardware.
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