In Morse code, what international distress signal replaced the original CQD in 1908?
CQD Convention, held in Berlin in 1906, Germany's "" distress signal of three-dots/three-dashes/three-dots () was adopted as the international Morse code distress signal. (This distress signal soon became known as "SOS" because if gaps are inserted it can be thought of as the Morse codes for those letters – by contrast CQD is transmitted as three distinct letters with a short gap between each. Germany had first adopted this distress signal in regulations effective 1 April 1905.) Between 1899 and 1908, nine documented rescues were made by the use of wireless. The earliest of these was a distress call from the
CQD CQD CQD (transmitted in Morse code as ) is one of the first distress signals adopted for radio use. It was announced on 7 January 1904, by "Circular 57" of the Marconi International Marine Communication Company, and became effective beginning 1 February 1904 for Marconi installations. Land telegraphs had traditionally used "CQ" ("""", from the French word "") to identify alert or precautionary messages of interest to all stations along a telegraph line, and CQ had also been adopted as a "general call" for maritime radio use. However, in landline usage there was no general emergency signal, so the Marconi