Safety, Fire & Survival · Distress Signals
The spoken radio distress signal indicating grave and imminent danger requiring immediate assistance is:
- APan-Pan
- BSecurité
- CRoger
- DMayday✓ Correct
Explanation
'Mayday', spoken three times, signals grave and imminent danger to a vessel or person requiring immediate assistance. 'Pan-Pan' is urgency (serious but not immediately life-threatening) and 'Securité' is safety (navigation or weather warnings).
Authority: Navigation Rules Annex IV; ITU/GMDSS radio procedures
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