Definition
Mayday, from the French venez m'aider, is the distress signal transmitted when a vessel or person is threatened by grave and imminent danger and requires immediate assistance. The word is spoken three times, followed by this is and the vessel name three times, then the call sign or MMSI, position, nature of distress, assistance required and number of persons on board. It is normally sent on VHF channel 16 after a DSC distress alert.
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