Subelement C: DSC & Alpha-Numeric ID Systems— Topic :
Question 18C6
Element 7R (GMDSS-RO)A VHF-DSC Distress alert will always be transmitted on what channel?
Explanation
A VHF-DSC Distress alert is always transmitted on Channel 70 (Ch-70) because it is the internationally designated and dedicated Digital Selective Calling (DSC) frequency. DSC is a digital signaling protocol used for automated maritime distress, urgency, safety, and routine calls. By having a specific, dedicated channel, all DSC-equipped radios can continuously monitor Ch-70 for these critical digital alerts, ensuring that distress signals are reliably received and acted upon.
Ch-16 is the traditional voice distress, safety, and calling channel, not for digital alerts. While crucial for voice communication, DSC alerts are not sent on Ch-16. Ch-22A is a U.S. Coast Guard working channel for voice communication, often used *after* initial contact. Ch-6 is an intership safety and communication voice channel. These are all voice-oriented channels, whereas DSC requires a dedicated digital frequency for its automated signaling.
Related Questions
18C4 Repetition of a DSC Distress call is normally automatic if not acknowledged after a delay of:18C5 A VHF-DSC Distress alert call: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?19D3 You receive a VHF-DSC Distress alert. What Channel should you monitor for further information?