Mayday or SOS

International emergency and rescue:

French phrases in international air-sea rescue {used by all countries}

International authorities have adopted a number of words and phrases from French for use by speakers of all languages in voice communications during air-sea rescues. Note that the "phonetic" versions of spelling are presented as shown and not the IPA.

SECURITAY

(sécurité, "safety") the following is a safety message or warning, the lowest level of danger.

PAN PAN

(panne, "breakdown") the following is a message concerning a danger to a person or ship, the next level of danger.

MAYDAY

([venez] m'aider, come to help me"; aidez-moi means "help me") the following is a message of extreme urgency, the highest level of danger. (MAYDAY is used on voice channels for the same uses as SOS on Morse channels.)

SEELONCE

(silence, "silence") keep this channel clear for air-sea rescue communications.

SEELONCE FEE NEE

(silence fini, "silence is over") this channel is now available again.

PRU DONCE

(prudence, "prudence") silence partially lifted, channel may be used again for urgent non-distress communication.

MAY DEE CAL

(médical, "medical") medical assistance needed.

It is a serious breach in most countries, and in international zones, to use any of these phrases without justification.

See Mayday (distress signal) for a more detailed explanation.