Sperry Marine Visionmaster FT ECDIS, User Manual

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Targets ECDIS User Guide
10-8 65900012
AIS Target Display Capacity
The target processing capacity for rendering AIS targets and other AIS
NAV symbols, such as
ATON , SAR and Base Station at any one time is
240.
If the number of AIS targets and AIS NAV symbols is near the maximum
allowed (95%) an
AIS Almost Full caution is raised.
An AIS Exceeds Capacity warning is raised when there are more than 240
AIS targets and AIS NAV symbols being reported to the system.
In the event of AIS display capacity being exceeded, only the closest 240
AIS targets to own ship are displayed and used for
CPA/TCPA . AIS targets
further away will not be rendered until the maximum capacity has receded.
Active AIS Target Capacity
The maximum number of active AIS targets on a single node or multi-node
is 40.
If the number of active AIS targets is near the maximum allowed (95%)
Active AIS Almost Full is shown as a caution.
If the number of active AIS targets reaches the maximum an Active AIS
Full warning is raised and no more AIS targets can be activated until one
or more AIS targets are set to sleeping.
Activating AIS Targets when Capacity is Reached
VisionMaster allows for the activation of AIS targets (and associated
tracking of any underlying radar target) 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. This will happen providing the
target is not infringing CPA/TCPA or BCR/BCT alarm criteria, designated a
target of interest by virtue of being selected for display in a target tote, or is
currently in an auto-activation zone.