What are the meanings of the three safety message prefixes for use in radio transmissions?

(1) Mayday (distress) means that a ship or other vehicle is threatened by grave and imminent danger and requests immediate assistance. 

(2) Pan Pan (urgency) means that the calling station has a very urgent message to transmit concerning the safety of a ship, aircraft or other vehicle, or of a person. (3) Securite (safety) means that the station is about to transmit a message concerning the safety of navigation or giving important meteorological warnings.


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