Morse Code SOS

Contrary to popular belief, the Morse code for symbol for SOS (. . . – - – . . .) is not an abbreviation or acronym for “save our ship,” “save our souls,” or “send out succour.” The code above was originally intended solely as a signal for distress and was first adopted by the German government in radio regulations in 1905. It soon became the global standard after the second International Radiotelegraphic Convention signed in 1906. The SOS distress signal remained the maritime signal up until recently when in 1999 it was replaced by the Global Maritime Distress Safety System, an international set of safety procedures. Learn Morse code!

Origin of SOS in Morse Code

The Germans never intended on naming the distress signal SOS, the codes makeup was just a simple way to transmit the signal and was easy to remember. It is easy to see why the code was translated into the popular terms mentioned above and how people confuse it for what it really is. One of the original distress signals used was “QCD” and was used by Marconi International Marine Communication Company. This code stood to mean “all stations, distress” and has also been commonly misinterpreted to mean “come quick, danger,” “come quickly, distress,” or “come quick- drowning!” The signal was used by Marconi operators but was never adopted by international standards because it could be mistaken for simply “CQ” or “general call” if the reception was poor. It wasn’t until 1912 and the sinking of the Titanic when the ship’s Marconi operators used both QCD and SOS distress signals to try and get help. Because of this ill-ending story and inconsistency amongst ship operators the use of the CQD has died out.

SOS as a distress call has always been transmitted as a continuous sequence of dits-and-dahs without the spacing that goes between letters in traditional transmissions. The term was regarded as safe for use as long as the Morse code operators were aware that it was just a convenient way for them to remember the distress signal and not transmit it in the literal sense. Eventually SOS was written with a bar over it to designate that it was to be transmitted continuously and without internal spaces.

Another notable characteristic of the signal is that it can be used visually as well. It can be used in three short flashes, three long, then three short to signal distress visually as well as spelled out so that it can be viewed from above perhaps by a rescue plane or chopper. The neat thing about SOS is that it is readable upside down as well as right-side-up from above.