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3. DSC OVERVIEW
3-3
3.3 Audio Alarms
When you receive a distress alert or routine call addressed to your ship, the audio and
visual alarms are released. For the distress or urgency call, the audio alarm sounds until
the CANCEL key is pressed, and sounds for one minute and then automatically goes off
in case of other calls. The tone of the alarm changes with the call received. By becoming
accustomed to the tone, you can know which type of call you or other party have received.
Alarm Frequency (interval)
Safety call received 150 Hz (1000 ms) and 100 Hz (500 ms)
Routine call received 150 Hz (1000 ms) and 100 Hz (500 ms)
While DISTRESS button is pressed for four s 2000 Hz and 0 Hz (500 ms)
Distress alert sent 2200 Hz, continuous (2 seconds)
Own ship position not updated 2000 Hz (250 ms) and 0 Hz (500 ms)
Distress alert call received 2200 Hz and 1300 Hz (250 ms)
Distress relay call received 2200 Hz and 1300 Hz (250 ms)
Distress relay ack call received 2200 Hz and 1300 Hz (250 ms)
Distress ack call received 2200 Hz (500 ms) and 1300 Hz (500 ms)
Urgency call received 2200 Hz and 0 Hz (250 ms)
Urgency ack call received 2200 Hz and 0 Hz (500 ms)