ECDIS-E User Guide Targets
65934012 9-3
Activating AIS Targets when Capacity is Reached
VisionMaster allows for the activation of AIS targets even when the
activated capacity has been reached (i.e. 40 activated AIS targets).
This is done by the system selecting the least navigationally significant
target and automatically setting it to sleeping (with any underlying tracked
target being cancelled).
When a sleeping AIS target is selected for activation whilst at capacity the
system will determine which active AIS target is least significant and
automatically set that target to sleeping, provided the target is not infringing
CPA/TCPA or BCR/BCT alarm criteria or designated a target of interest by
virtue of being selected for display in a target tote, or is currently in an auto-
activation zone.
The following criteria are used for determining the least navigationally
significant target:
1. First the system looks for targets that are 1 minute or more past
TCPA, and within this group will drop the target at the greatest
range from own ship.
2. If no active AIS targets are at least 1 minute past TCPA then the
AIS target most distant from own ship will be set to sleeping.
AIS targets can also be automatically dropped by the operator adjusting the
`Autodrop' range lower than the default of 10 NM. For details, refer to
`AutoDrop Targets’ in Target Display.
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