similar to a radar guard alarm. You select the range for the alarm and
if any vessel is currently within that range, in any direction around
you, the alarm is triggered.
When a guard range is selected, a guard alarm is only triggered for a
target when it is currently within the guard range and is not based on
whether the target will enter the guard range at some time in the
future.
You can also select to have all targets trigger an alarm regardless of
their range by setting the guard alarm to “ALL” rather than a specific
range. When this setting is enabled the alarm will sound when data is
first received for each target. This alarm setting is most useful
offshore or anywhere targets are expected to be encountered
infrequently. It is used to notify the user that an AIS target exists
“out there” even if the target poses no collision risk.
When a guard alarm is triggered the target is immediately displayed.
Press the
Mute
button to silence the alarm. No further alarms will be
triggered for this target. However, if you still wish to have a
subsequent CPA alarm for this target, press the
Alarm
button to re-
enable alarms for the target. When you re-enable alarms, the guard
alarm is not sounded again. Only subsequent CPA alarms will be re-
enabled. The reason is you have been alerted to the target's presence
and acknowledged it but have now indicated you also would like to
have an alarm triggered if a collision risk exists.
Important note: Guard alarms will not be triggered if GPS
information is unavailable for your vessel.
Guard alarms which
specify a range require GPS data for your vessel. These alarms will
not be triggered if GPS data is not available. However, if you set the
guard alarm to “ALL”, then the alarm will sound regardless of
whether GPS data is available or not. You can use this feature if you
have not connected the
AIS
WatchMate
to a GPS but wish to be alerted
when targets are present.
This is the only alarm setting that will
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Содержание WatchMate 650
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