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A Mayday call might result in the activation of a rescue vessel such as this Severn-class lifeboat.

Mayday is an emergency procedure word used internationally as a distress signal in voice procedure radio communications.

It is used to signal a life-threatening emergency primarily by mariners and aviators, but in some countries local organizations such as police forces, firefighters, and transportation organizations also use the term. The call is always given three times in a row ("Mayday Mayday Mayday") to prevent mistaking it for some similar-sounding phrase under noisy conditions, and to distinguish an actual Mayday call from a message about a Mayday call.

Mayday sections
Intro  History  Mayday calls  Other urgent calls  See also  References  External links  

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