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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" ("sécu", from the French word sécurité) 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 company added a "D" ("distress") to CQ in order to create its distress call. Sending "D" was already used internationally to indicate an urgent message. Thus, "CQD" is understood by wireless operators to mean, "All stations: distress." Contrary to popular belief, CQD does not stand for "Come Quick, Danger", "Come Quickly: Distress", "Come Quick—Drowning!", or "C Q Danger" (Seek You, Danger); these are backronyms.
Although used worldwide by Marconi operators, CQD was never adopted as an international standard, since it could be mistaken for a general call "CQ" if the reception were poor. At the second International Radiotelegraphic Convention, held in Berlin in 1906, Germany's Notzeichen 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". 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 East Goodwin lightship. However, for the earliest of these, there was no standardized distress signal. The first US ship to send a wireless distress call in 1905 simply sent HELP (in both International Morse and American Morse). By February 1904, the Marconi Wireless Company required all of its operators to use CQD for a ship in distress or for requiring URGENT assistance. In the early morning of 23 January 1909, whilst sailing into New York from Liverpool, RMS Republic collided with the Italian liner SS Florida in fog off the island of Nantucket, Massachusetts, United States. Radio Operator Jack Binns sent the CQD distress signal by wireless transmission.
In April 1912, RMS Titanic radio operator Jack Phillips initially sent "CQD", which was still commonly used by British ships. Harold Bride, the junior radio operator, suggested using "SOS", saying half-jokingly that it might be his last chance to use the new code. Phillips thereafter began to alternate between the two.
- 500 kHz (Morse distress frequency)
- 2182 kHz (voice distress frequency)
- Distress signal
- Global Maritime Distress Safety System
- Prosigns for Morse code
- Le Robert & Collins Senior (2002), Dictionnaire français-anglais, anglais-français, Paris: Dictionnaires Le Robert-VUEF. re: sécurité : e.g. des mesures de sécurité, "safety measures, precautions, or alerts"
- Campbell, p. 218
- Jack Binns: Hero.
- Campbell (2008: 1911)
- Stephan Dubreuil, Come Quick, Danger: A History of Marine Radio in Canada, Ottawa: Fisheries and Oceans Canada, Coast Guard, 1998. OCLC 39748172.
- Pete Caesar, SOS ... CQD: Four Ships in Trouble, Muskegon, Mich.: Marine Press, 1977. OCLC 3182026.
- Ballard C. Campbell,Disasters, Accidents, and Crises in American History, Infobase Publishing, 2008 ISBN 1438130120.
- "C Q D" by Alfred M. Caddell—from Radio Broadcast, April 1924, pages 449–455; described as "The Story of the First Sea Rescue by Radio".