🔍 Key Concepts
• False distress alert procedures in GMDSS/VHF
• The role of VHF Channel 16 as the international distress, safety, and calling frequency
• The difference between DSC (Digital Selective Calling) on Ch-70 and voice announcements on working channels
💭 Think About
• After a false distress alert goes out, who needs to hear your cancellation message, and which channel are they most likely monitoring?
• Is the cancellation normally done by DSC, by voice, or can it be a combination—and which method is emphasized for an immediate "all ships" explanation?
• Which channel is specifically designated for distress and safety voice traffic, not just digital calls or port-operations traffic?
✅ Before You Answer
• Verify which channel is designated internationally for distress, safety, and calling (voice) on VHF.
• Check whether Ch-70 is used for voice or only for DSC digital signaling.
• Confirm which channels (13, 22A, 16) are normally used for bridge-to-bridge, coast guard working, and distress/safety communications.