VisionMaster Ship’s Manual Chapter 1
Technical Specification AIS Targets
65900011 1–29
The following alarm states apply to all AIS targets:
• Infringe bow crossing limits (range and time)
• Dangerous target (CPA/TCPA infringement)
• Enter acquisition zone
• Lost (sleeping targets do not raise a Lost alarm)
The system uses ship categories and intervals to define when a target is
shown as lost.
AIS targets are prioritised as Class A or Class B, according to importance.
The system can display class A targets only (default setting), class B targets
only, or class A and B.
Table 25: Ship Categories and Lost Target Intervals
When an AIS target is activated the system displays alphanumeric
information on the target.
In addition to the tracker parameters shown in Table 24, for AIS targets the
system displays the additional information of the target’s current heading.
Up to 200 AIS targets can be displayed in the video circle at any one time.
When AIS targets are not shown, received AIS transmissions continue to be
stored so that the targets can be render quickly when conditions indicate
rendering should proceed. The system can simultaneously store information
on up to 500 AIS targets.
Ship Category
Lost Target
Interval (Class A)
Lost Target
Interval (Class B)
anchored or moored and speed <= 3 knots 18 minutes 18 minutes
anchored or moored and speed > 3 knots 60 seconds N/A
0 <= speed <= 14 knots 60 seconds 180 seconds
0 <= speed <= 14 knots and changing
course
60 seconds -
14 < speed <= 23 knots 36 seconds 90 seconds
14 < speed <= 23 knots and changing
course
36 seconds -
speed > 23 knots 12 seconds 30 seconds
speed > 23 knots and changing course 12 seconds -
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