1-9. Definitions Of Ais Target Symbols - JRC JMA-9922-6XA Instruction Manual

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1-9. Definitions of AIS Target Symbols

The AIS symbol is as follows.
Symbol AIS Target
Sleeping
Target
Activated
Target
Selected
Target
Dangerous
Target
Lost Target A symbol representing the last valid predicted position of an AIS
Definitions & Meaning
A target symbol indicating the presence and orientation of a
vessel equipped with AIS in a certain location. No additional
information is presented until activated thus avoiding information
overload.
The most acute apex of the triangle is aligned with the heading of
the target, or with its COG.
A symbol representing the automatic or manual activation of a
sleeping target for the display of additional graphically presented
information including:
- a vector (speed and course over ground or water);
- the heading; and
ROT or direction of turn indication (if available) to display
-
actually initiated course changes.
The COG/SOG vector is displayed as dashed line.
The heading is displayed as solid line of fixed length.
A flag on the heading indicates a turned its direction in order to
detect a target maneuver.
When no data is coming, the vector , heading and flag are not
displayed.
A symbol representing the manual or automatic selection of any
AIS target for the display of detailed information in a separate
data display area. In this area, received target data as well as the
calculated CPA and TCPA values will be shown.
Squares indicated by its corners are drawn around the target
symbol. This mark is displayed on the around of a numerical
display target.
A symbol representing an AIS target (activated or not) which data
contravene pre-set CPA and TCPA limits.
CPA/TCPA alarm sound occurs and a symbol is flashed until
acknowledged.
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