1-13. Conditions Of Ais Symbol Display; Maximum Ais Target Number And Display Priority; Ais Target Vector Display - JRC JMA-9922-6XA Instruction Manual

● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●

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
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.
st
target enters, "AIS MAX TARGET"
A-37