
APRA-ADDITIONAL FACILITIES
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5.2.3 Anchor watch
This facility attempts to offer automatic warning of the
observing vessel or other vessels dragging in an anchor-
age.
If
a
known stationary target (for example, a small
isolated navigation mark) is acquired and designated as
such then an alarm will be activated if the designated
target moves more than a preset distance from the
marked position. If the stationary target appears to
move, then it must be due to the observing vessel drag-
ging her anchor. Alternatively, it will give a warning if
another 'tracked' vessel in the anchorage drags her
anchor; it will, of course, be activated if such a ...