Chapter 1 VisionMaster Ship’s Manual
Auto-acquisition Zones Technical Specification
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7.18.3 Auto-acquisition Zones
Two annular auto-acquisition zones can be defined by the operator. Any
target that enters these areas is automatically acquired and tracked by the
system. Each acquisition zone can be turned on or off. Auto acquisition zones
are relative to own ship’s heading and are disabled after a heading data
becomes unusable.
Any targets found in an auto acquisition zone are marked by a flashing zone
infringement symbol and raise an AZ entry alarm. The AZ infringement
symbol is displayed over existing target symbols (AIS and radar) and over
acquiring target symbols when the AZ entry alarm is active; the symbol is not
displayed after the alarm is acknowledged.
The default auto-acquisition zones are two sections of an annulus. The zone
annulus is defined from the start bearing clockwise to the end bearing, i.e. the
arcs will extend clockwise from the start position. The ranges and depths are
the same, irrespective of whether a metric, nm, or sm display has been
selected.
If an attempt is made to define a zone with a subtended angle of >354º, the
result will be a 360º zone.
Table 26: Auto Acquisition Zone Parameters
The initial auto-acquisition zone definitions (i.e. the first time the system is
run) are shown below.
Table 27: Auto Acquisition Default Zone Definitions
Limits on Annulus
Parameter Min Max
Range 1.0 NM 40.0 NM
Depth 0.4 NM 2.0 NM
Bearing (when not a full annulus) 6° 354°
Default Zone Definitions
Zone 1
Range 4 to 5 NM
Bearing 270° to 90°
Zone 2
Range 12 to 14 NM
Bearing 270° to 90°
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