Originaly, in the early 1900s, the international call for help was "CQD". QCD was used by British radio operators and it meant "All stations attend: Distress". QCD was a poor English way of saying Securite were replaced later by "SOS". SOS was easier to pound out on telegraph keys using Morse Code, the only signal could then be sent. In 1927, the distress signal was changed to "Mayday!," which comes from the French M'aidez, meaning "Help me!"
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