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SOS is a Morse code distress signal ( ), used internationally, originally established for maritime use.In formal notation SOS is written with an overscore line (SOS), to indicate that the Morse code equivalents for the individual letters of "SOS" are transmitted as an unbroken sequence of three dots / three dashes / three dots, with no spaces between the letters. [1]
Transmitting a digital distress signal by activating (or pressing) the distress button (or key) on an Inmarsat-C satellite internet device [2] Sending the Morse code group SOS ( ) by light flashes or sounds [2] Burning a red flare (either hand-held or aerial parachute flare) [2]
Why was SOS chosen as a distress signal? By 1908, the triple dot-dash-dot code became the official international radio distress signal and remained that way until 1999, when Morse code was ...
The procedure signs below are compiled from the official specification for Morse Code, ITU-R M.1677, International Morse Code, [1] while others are defined the International Radio Regulations for Mobile Maritime Service, including ITU-R M.1170, [8] ITU-R M.1172, [4] and the Maritime International Code of Signals, [5] with a few details of their ...
Morse code can be used visually as well, using the same series only with flashes of light. ... know that you can signal your distress using SOS (remember 3 short - 3 long - 3 short) either ...
By 1908, the code we know and love took effect as the official international radio distress signal, and remained that way until 1999, when Morse code was declared all but dead.
In contrast, CQD is transmitted as three distinct letters with a short gap between each, like regular text. The SOS distress code is also easier to hear as it is nine symbols long, while no other character or sign is longer than six symbols. Germany had first adopted this distress signal in regulations effective 1 April 1905. [6] [7]
Chart of the Morse code 26 letters and 10 numerals [1]. This Morse key was originally used by Gotthard railway, later by a shortwave radio amateur [2]. Morse code is a telecommunications method which encodes text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs.