Northrop Grumman Sperry Marine VisionMaster FT, Руководство пользователя

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Targets Radar/Chart Radar User Guide
10-8 65900010
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%) an
Active AIS Almost Full caution is raised.
An Active AIS Full warning is raised when an attempt is made to activate a
target (by any means) when the number of active AIS targets has reached
the maximum. In this case one or more AIS targets must be set to sleeping
before further AIS targets can be activated.
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-acquisition 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 the Target Display section.