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APPENDIX
1-13. Conditions of AIS Symbol Display
Maximum Target Number and Display Priority
Up to 50 AIS target symbols can be displayed in JMA-9900 series radar. When more than 50 AIS
targets exist, 50 targets to be displayed are selected by the following priority order.
1. Dangerous target. (Both CPA and TCPA of a target are less than the preset CPA and
TCPA safe limit.)
2. Selected Target for numerical data display.
3. The target specified in target search mode. (See 1-4 Note for search mode)
4. The target in an AIS filter. (The closer target from own ship in the filter has higher priority
than further ones.)
5. Targets outside of a filter and they do not conform with the above 1 to 4 conditions. A
nearer target from own ship has higher priority than further ones.
Note:
When the 50 AIS targets symbol are displayed and 51
st
target enters, "AIS MAX TARGET"
message appears at the lower right part of the screen and alarm sounds with “Pi! Pi! “.
AIS Target Vector Display
- The vector of an AIS symbol is displayed in either ground-stabilized or sea-stabilized by a setup
of the own speed equipment.
The vector used now is displayed on "OS STAB" at the upper right of a screen.
When displayed as "OS STAB GND"--- AIS Vector presentation is Ground-stabilized
When displayed as "OS STAB SEA" --- AIS Vector presentation is Sea-stabilized
- When the vector of an AIS symbol is displayed by sea-stabilized, the sea-stabilized vector of
AIS target is calculated from the COG/SOG of AIS target and the own ship COG/SOG &
CSE/STW information.
-
Note:
The vector of AIS target is not displayed in following cases.
Case 1: COG / SOG data is not transmitted from GPS/DGPS.
Case 2: The selected speed equipment is not working normally.
355


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