Editing CQD (section)

==Replacement==
At the first International Radiotelegraphic Convention, held in Berlin in 1906, Germany's ''{{lang|de|Notzeichen}}'' distress signal of three-dots three-dashes three-dots ({{morse|dot|dot|dot|dash|dash|dash|dot|dot|dot}}) was adopted as the international Morse code distress signal.<ref>{{cite book |url=https://babel.hathitrust.org/cgi/pt?id=uc2.ark:/13960/t80k29264&view=1up&seq=42 |article=Service Regulation XVI |title=1906 International Wireless Telegraph Convention |publisher=U.S. Government Printing Office |page=38 |access-date=5 January 2021 |archive-date=5 January 2021 |archive-url=https://web.archive.org/web/20210105080721/https://babel.hathitrust.org/cgi/pt?id=uc2.ark%3A%2F13960%2Ft80k29264&view=1up&seq=42 |url-status=live }}</ref>

This signal soon became known as [[SOS]] because it has the same dash-dot sequence as the letters with the gaps between them removed, and in fact is properly written {{overline|SOS}}, with an overbar, to distinguish it from the three individual letters{{Citation needed|reason=We need an authoritative source for the claim of "properly written"|date=January 2025}}. In contrast, CQD is transmitted as three distinct letters with a short gap between each, like regular text. SOS is also easier to hear as it is nine&nbsp;symbols long, while no other character or sign is longer than six&nbsp;symbols. Germany had first adopted SOS in regulations effective 1&nbsp;April 1905.<ref>{{cite journal |url=https://babel.hathitrust.org/cgi/pt?id=mdp.39015084596132&view=1up&seq=457 |title=Regelung der Funkentelegraphie im Deutschen Reich |journal=Elektrotechnische Zeitschrift |date=27 April 1905 |pages=413–414 |access-date=21 August 2019 |archive-date=5 January 2021 |archive-url=https://web.archive.org/web/20210105080722/https://babel.hathitrust.org/cgi/pt?id=mdp.39015084596132&view=1up&seq=445 |url-status=live }}</ref><ref>{{cite journal |url=https://babel.hathitrust.org/cgi/pt?id=njp.32101050973294&view=1up&seq=118 |title=German Regulations for the Control of Spark Telegraphy |journal=The Electrician |date=5 May 1905 |pages=94–95 |access-date=21 August 2019 |archive-date=5 January 2021 |archive-url=https://web.archive.org/web/20210105080700/https://babel.hathitrust.org/cgi/pt?id=njp.32101050973294&view=1up&seq=116 |url-status=live }}</ref>