Stations hearing this distress call were to immediately cease handling traffic until the emergency was over and were likewise bound to answer the distress signal.Īlthough the use of “SOS” was officially ratified in 1908, the use of “CQD” lingered for several more years, especially in British service where it originated. ” All the popular interpretations of “SOS,” “Save Our Ship,” “Save Our Souls,” or “Send Out Succour” are simply not valid.
There is no special signification in the letter themselves, and it is entirely incorrect to put full stops between them. The Marconi Yearbook of Wireless Telegraphy and Telephony, 1918 states, “This signal was adopted simply on account of its easy radiation and its unmistakable character. It was to be sent together as one string. The thinking was that three dots, three dashes and three dots could not be misinterpreted. Considerable discussion ensued and finally SOS was adopted. A strict interpretation would be “All stations, Distress.”Īt the second Berlin Radiotelegraphic Conference 1906, the subject of a danger signal was again addressed. It is a general call, “CQ,” followed by “D,” meaning distress. Although generally accepted to mean, “Come Quick Danger,” that is not the case. In 1904, the Marconi company suggested the use of “CQD” for a distress signal. This sign for “all stations” was adopted soon after wireless came into being by both ships and shore stations. Naturally, “CQ,” went with the operators to sea and was likewise used for a general call. By using “CQ,” each station receives a message from a single transmission and an economy of time and labor was realized. “CQ” was generally adopted by telegraph and cable stations all over the world. In England a general call on the landline wire was a “CQ.” “CQ” preceded time signals and special notices.
The wireless operators came from the ranks of railroad and postal telegraphers. The letter “A” is represented by a dot followed by a dash:īy 1904 there were many trans-Atlantic British ships equipped with wireless communications. Spoken, short signals are referred to as “dih” and long signals are referred to as “dah”.
Morse Code is a way of “tapping” out letters using a series of dots (short signals) and dashes (long signals). The wireless telegraphers used Morse Code to send messages. Until then, ships at sea out of visual range were very much isolated from shore and other ships. The practical use of wireless telegraphy was made possible by Guglielmo Marconi in the closing years of the 19th century. Or is it? The SOS Morse code conveniently means nothing else, so it messages can’t possible get confused either. It’s just one of those convenient accidents. It just so happens that three dots also means “S” and three dashes means “O” in the Morse Code alphabet. The Morse Code is a line of three dots, three dashes, and three more dots. If you’ve been wondering “what does SOS stand for?” the truth is that it doesn’t stand for anything. So, what does SOS stand for? Absolutely nothing. 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? There is much mystery and misinformation surrounding the origin and use of maritime distress calls.