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170 C-Series Display Reference Manual
11.5How is AIS data displayed?
The AIS system displays other AIS equipped vessels in the surrounding area as
triangular targets overlaid on a chart or radar window. Up to 100 targets are displayed.
As the vessel’s status changes, the symbol for the target will change accordingly.
Vectors can be displayed for each target. These vectors indicate the direction of travel
and rate of turn of the vessel and the distance it will travel over a specified period of
time (COG/SOG vector). Targets displayed with their vectors are referred to as ‘active
targets’ and are scaled according to the size of the vessel. The larger the vessel the
larger the target. You can either display all targets or just dangerous targets (
page 176
).
AIS Target symbols
D9056_1
097°T
11.6kt
1.237nm
00h04m33s
Safety
critical data
Heading
Large
vessel
Direction
of turn
Small
vessel
Sleeping
target
Dangerous
target (flashes)
Safe zone (defined by
distance or time)
COG/SOG
vector
Uncertain target
Calculated CPA/TCPA value uncertain.
Sleeping target
Target not activated, dangerous or lost.
Activated target
Target activated i.e. AIS vector displayed.
Vector line (optional) shows predicted distance travelled within
given time.
Dangerous target
Targets within specified distance (CPA) or time (TCPA).
Dangerous target alarm sounds if en-abled.
Target flashes.
Lost target
When signal of dangerous target not received for 20 seconds.
Target in latest predicted position.
Alarms sounds if enabled.
Target flashes.
Selected target
Target selected with cursor.
Can activate the target and view detailed data.
COG/SOG
vector
Heading
Direction
of turn
AIS
D8523-1
81221_4.book Page 170 Tuesday, February 28, 2006 5:24 PM