What code was used in the navy before introducing SOS?
CQD
CDQ
DCQ
DSC
CQD is one of the first distress signals adopted for radio use. 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. 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" .
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Answers by country
CQD
CDQ
DCQ
DSC
answers
Austria
30
India
14
Germany
130
Poland
1487
the United Kingdom
24
the United States
24
Switzerland
10
Australia
14
Greece
12