JRC JMA-5312-6 Instruction Manual page 257

Up to 300 targets can be displayed in total of activated and sleeping AIS targets. Up to 100 activated AIS
targets can be included in the total.
If there are more AIS targets than the allowable maximum, they are displayed in the following priority order:
1. Numeric displayed target
2. Target of which CPA / TCPA is lower than the set value
(Target as a dangerous ship for which an alarm has occurred)
3. Target in automatic activation zone
4. Activated AIS target
5. Target inside AIS filter
6. Target outside AIS filter
If the number of targets at the same priority level exceeds the allowable maximum, they are displayed in the
following priority order:
1. Association target
2. Activated AIS target
3. Sleeping AIS target
The vector of an AIS target is to be displayed with a vector over ground or over water, depending on the speed
sensor setting and current offset setting. The type of the currently displayed vector can be confirmed by
viewing the setting of the stable mode.
When GND is displayed for the stability mode (upper left of the display on page 2-2):
Vector over ground
When Sea is displayed for the stability mode (upper left of the display on page 2-2):
Vector over water
When the vector of an AIS target is displayed with a vector over water, the system has converted the AIS
target's vector over ground to the vector over water according to the data received from the AIS and the own
ship's information.
Note: When the AIS target's symbol is activated but the vector is not displayed, the following are
probable causes of the trouble:
COG/SOG is not yet input from the GPS.
The selected speed sensor is malfunctioning.
Types and Definitions of Association Target Symbols
When a tracked target and an AIS target are decided as identical, it is displayed with either of the following
symbols:
Vector/Symbol Definition
Priority for tracked
target
Association target
Priority for AIS
target
Association target
5-8
5.1 Preparation
Remarks
5