The International Radio Telegraphic Convention chose the SOS signal in 1906. Though the SOS signal is well known in most circles these days, its original use was strictly maritime. Most of the general populace believes that “SOS” signifies “Save Our Ship.” Casual students of radio history are aware that the use of “SOS” was preceded by “CQD.” Why were these signals adopted? When were they used? History of the SOS Signal ![]() There is much mystery and misinformation surrounding the origin and use of maritime distress calls. ![]() Harmony asks “Do the letters in the term SOS represent three words? If so, could you let me know what they are?” Thanks to Neal McEwen for allowing us to use some information from his articles “SOS”, “CQD” and the History of Maritime Distress Calls.
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