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VHF / DSC

DSC distress button

Technical visualDSC distress process
DSC distress processA generic process shows valid position data reaching a DSC VHF, a digital distress alert on Channel 70, then a voice MAYDAY follow-up on Channel 16.POSITIONDSC VHFCH 70CH 16
DSC distress processA generic process shows valid position data reaching a DSC VHF, a digital distress alert on Channel 70, then a voice MAYDAY follow-up on Channel 16.POSITIONDSC VHFCH 70DIGITAL DISTRESS ALERTCH 16

Valid position only when connected and current · control layout varies by manufacturer

Follow the radio manufacturer's distress-control instructions. A DSC alert on Channel 70 is followed by a voice MAYDAY on Channel 16.

Exact control layout varies by radio, so follow the manufacturer's instructions.

General sequence:

If time permits, select the nature of distress.

Activate the protected DSC distress control as directed by the manufacturer, commonly requiring a deliberate press-and-hold.

The radio sends the distress alert on Channel 70.

If the radio has valid position data, position is included.

Follow with a voice MAYDAY on Channel 16.

Remain available for response.

A radio with no internal GNSS and no valid external position feed cannot magically transmit a current position.

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