JRC JMA-5212-4 - Displaying Numeric Data of AIS Targets (TGT DATA)

5.3 AIS OPERATION
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5.3.6 Displaying Numeric Data of AIS Targets (TGT DATA)
Numerical data for a specified AIS target is displayed.
Types of numeric data displayed
Display items
y Navigation information
BRG (true bearing) 0.01q unit
RANGE 0.01nm unit
COG (course over ground) 0.1q unit
SOG (speed over ground) 0.1knot unit
CPA (closest point of approach) 0.1nm unit
TCPA (time to CPA) 0.1min unit
HDG (heading bearing) 1q unit
ROT (course change speed) 0.01q/min
y Destination and location information
Destination
Estimated time of arrival
L/L (latitude/longitude) 0.0001’ unit
Position fixing device
RAIM
Position fixing accuracy
y Ship information
NAME (ship name) Up to 20 characters
CALL SIGN Up to 7 characters
MMSI Up to 9 characters
IMO number
Navigation status
y AtoN information
AtoN class
AtoN type
If missing is displayed in place of the numeric information of ROT, the radar is receiving the AIS data which
cannot is displayed. In this case, you can only trust the turning direction which is indicated by the turn indicator.
The turn indicator is displayed on the AIS symbol as the line perpendicular to the heading direction. (Refer to
Section 5.1.2 "Types and Definitions of AIS Target Symbols")
If the numeric information of SOG or STW is 102.2kn, the target ship's speed is 102.2kn or over. Then the
system cannot calculate CPA and TCPA. Therefore, missing is indicated in the CPA and TCPA information.