Northrop Grumman Sperry Marine VisionMaster FT, User Manual

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Radar/Chart Radar User Guide Targets
65900010 10-9
Target Alert States
The following alert states apply to any AIS target in any state, (with the
exception that sleeping targets do not raise the Lost alert):
 CPA/TCPA/BCR or Acquisition Zone infringement
 Lost
CPA/TCPA/BCR
or Acquisition
zone
infringement When an AIS target infringes the
CPA/TCPA /BCR criteria, or when it
enters an Acquisition zone, the target
symbol and its heading/vector are
rendered in flashing red.
When the AIS scaled ship symbol is used
the ship outline is also rendered in
flashing red.
Lost Activated targets that are deemed lost
are rendered with a red cross through the
AIS symbol. The target maintains its last
heading and COG/SOG and will continue
to be dead reckoned until the
Lost
Target alert is acknowledged. The cross
symbol flashes while the alert is
unacknowledged.
Note that lost AIS targets do not generate
CPA/TCPA alerts.
AIS targets in an Acquisition Zone will remain flashing red until the AZ
Entry alert is acknowledged (see Alert Status Indicator). When the alert
has been acknowledged the AIS symbol will revert to its normal (green)
state, even when the target remains in the Acquisition Zone.
When CPA/TCPA Limit and Bow Crossing Limit alerts have been
acknowledged the AIS symbol stops flashing, but the symbol remains in
red until the CPA/TCPA and Bow Crossing infringement limits no longer
apply.