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The distress signal "CQD" is established only to be replaced two years later by "SOS".
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Distress signal
Internationally recognized means for obtaining help
A distress signal, also known as a distress call, is an internationally recognized means for obtaining help. Distress signals are communicated by transmitting radio signals, displaying a visually observable item or illumination, or making a sound audible from a distance.Source: Wikipedia (CC BY-SA)
CQD
Morse code distress call in the early 20th century
CQD is one of the first distress signals adopted for radio use. On 7 January 1904 the Marconi International Marine Communication Company issued "Circular 57", which specified that, for the company's installations, beginning 1 February 1904 "the call to be given by ships in…Source: Wikipedia (CC BY-SA)
SOS
International Morse code distress signal for help
SOS is a Morse code distress signal, used internationally, originally established for maritime use. In formal notation SOS is written with an overscore line, to indicate that the Morse code equivalents for the individual letters of "SOS" are transmitted as an unbroken sequence…Source: Wikipedia (CC BY-SA)
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