He also had the suggestion that "ships in distress. At the time, Captain Quintino Bonomo, an Italian representative, discussed the need for common operating procedures. The first International Radiotelegraphic Conference was held in Berlin, Germany in 1903. Cooperation was somewhat limited by national differences and rivalries between different radio companies. It used Morse code, the dit-and-dah system originally developed for landline telegraphy.When radio communication was made available to ships, there was a need for standardized communication. In the beginning, radio was called wireless telegraphy. They used such things as semaphore flags, signal flares, bells, and foghorns. Many songs have been made of the distress signal SOS, such as Message in a Bottle by The Police, "SOS" by ABBA, " SOS" by Rihanna, "S.O.S." by the Jonas Brothers, "Stranger" by Gamma, "S.O.S" by The Suicide Machines, "S.O.S" by Ola Svensson and "SOS" by Avicii.Įarly developments īefore radio communication was developed in the early 1890s, seagoing ships had already adopted many different visual and audio distress signals. In reality the signal SOS is not an acronym and doesn't stand for anything. However, these phrases were a later development, most likely as a Mnemonic to help remember the correct letters-something known as a backronym. In popular usage, SOS became associated with phrases such as "Save Our Souls," "Save our Ship", and others. In modern terminology, SOS is a " procedural signal" or "prosign", and the formal way to write it is with a bar above the letters. In International Morse Code, three dits form the letter S, and three dahs make the letter O, so "SOS" became an easy way to remember the correct order of the dits and dahs. The convention became effective on July 1, 1908.įrom the beginning, the SOS distress signal has actually been a continuous sequence of three- dits/three- dahs/three-dits, all run together without letter spacing. It became the worldwide standard when it was included in the second International Radiotelegraphic Convention, which was signed on November 3, 1906. It was introduced by the German government in radio regulations on April 1, 1905. It is used as distress code, to signal danger. Drawing of RMS Titanic's captain and radio operator, titled "The S.O.S"
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