Targets
ECDIS-E User Guide
9-2
65934012
AIS Targets
AIS Rendering Conditions
AIS targets are only rendered when the following conditions apply:
There is a valid position and heading for own ship.
Enable Input
is checked in AIS Display.
AIS target messages are being received and are valid.
The Sleeping Target filter setting is checked in AIS Display.
Own ship's position in WGS84 datum is known.
When AIS targets are not being rendered, received AIS transmissions
continue to be stored so that known targets can be rendered quickly when
conditions indicate rendering should proceed.
For information on enabling AIS input and setting AIS filter settings,
including AIS objects, refer to AIS Display.
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 Nearly 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 warning.
If the number of active AIS targets exceeds the maximum an
Active AIS
Full
alarm is raised.
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