đ Key Concepts
⢠GMDSS distress, urgency, and safety priorities on VHF/MF/HF/DSC
⢠The meaning and use of the URGENT (PAN-PAN) call versus DISTRESS (MAYDAY) and SAFETY (SECURITE) calls
⢠General rule for what type of traffic may interrupt or override other traffic on the same frequency
đ Think About
⢠Think about which type of call is used when there is immediate danger to life, and whether that would be above or below an urgency call in priority.
⢠Consider the usual order in which radio traffic is cleared on a busy distress frequency: what MUST be cleared first, what comes next, and what can wait?
⢠Ask yourself what kind of messages are sent as safety calls, and whether they should or should not break into an ongoing urgency exchange.
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Before You Answer
⢠Verify the standard ITU/GMDSS priority order of radio traffic categories (distress, urgency, safety, routine).
⢠Check the typical voice prowords used: "MAYDAY", "PAN-PAN", and "SECURITE", and how they relate to priority.
⢠Confirm that routine or ship-to-ship working traffic is handled only after higherâpriority categories are clear.