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5.3 AIS OPERATION
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If a vector is not displayed even when the AIS symbol is
activated, probable causes are as follows:
1. COG/SOG from the GPS has not been entered.
2. The selected speed sensor is malfunctioning.
5.3.11 Displaying AIS Symbols
Maximum number of targets and the display priority
A radar of the JMA-5200 series displays AIS symbols for a maximum of 50 targets. When 50 AIS targets or
more exist, they are displayed according to the following priority:
1. Target for which numeric data is displayed
2. Target displayed by the AIS target search function
3. Target whose CPA/TCPA is the set value or less.
(Target for which a dangerous ship alarm has been issued)
4. Target in the AIS filter
(Targets closer to the own ship in the filter have higher priority.)
5. Targets other than the above, which are outside the AIS filter
(Targets closer to the own ship in the filter have higher priority.)
Displaying the vectors of AIS symbols
The vector of an AIS symbol is to be displayed as a vector over water or over ground, depending on the speed
sensor setting and current offset setting. The type of the currently displayed vector is confirmed in the own
ship’s information display area at the upper right of the radar display.
When “GROUND” is displayed to the right of OS STAB: Vector over ground
When “SEA” is displayed to the right of OS STAB: Vector over water
When the vector of an AIS symbol is displayed as a vector over water, the system has converted the AIS
symbol’s vector over ground to the vector over water according to the data received from the AIS and the own
ship’s information.
When the system receives the data of the 51-th target
ship, it displays AIS MAX TARGET at the right lower
of the radar display, and issues audible alarm (beep
sound of pipi).
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