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3.6.3 Alarm Input
Alarms from other navigational equipment can be inputted via NMEA sentences. It conforms
to IEC61162-1 ALR sentences.
$ -- ALR, hhmmss.ss, xxx,A,A, c-c*hh<CR> <LF>
Time of alarm condition change, UTC
Alarm's acknowledge state, A=acknowledged
V=unacknowledged
Alarm condition, A=threshold exceeded
V=not exceeded
Unique alarm number (identifier) at alarm source
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