3. DSC OVERVIEW

3.3Audio 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)

 

 

 

3-3

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Image 35
Furuno FS-5070 manual Audio Alarms, Alarm Frequency interval