Subelement D: Distress, Urgency & Safety Comms— Topic :
Question 19D3
Element 7R (GMDSS-RO)You receive a VHF-DSC Distress alert. What Channel should you monitor for further information?
Explanation
A VHF-DSC (Digital Selective Calling) distress alert is transmitted on Channel 70. This channel is dedicated solely to DSC signaling, acting as an automated "digital doorbell" to initiate calls, including distress alerts. However, it is not used for voice communication.
Once a DSC distress alert is received, the international standard dictates that all subsequent voice communication regarding that distress incident takes place on Channel 16. Channel 16 is the internationally recognized distress, safety, and calling *voice* channel. Therefore, after receiving a DSC alert, you should switch your radio to Channel 16 to monitor for voice distress traffic and any further information or instructions from the vessel in distress or rescue authorities.
Channels 06 and 22A are working channels and not designated as the primary international voice distress channel. Channel 70 is for DSC signaling only, not voice.
Related Questions
19D1 If a VHF-DSC Distress alert is transmitted what channel is used for follow-on voice transmission?19D2 Why should you always follow on with a voice transmission after sending a DSC Distress alert?19D4 What is the proper format for a Distress follow on voice transmission? (3x is three times),19D5 What information should be included in a Distress follow on voice transmission after a DSC Alert?19D6 What information is not vital in a Distress follow on voice transmission after a DSC Alert?