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
flagAustria
66%
16%
3%
13%
30
flagIndia
42%
42%
14%
0%
14
flagGermany
40%
20%
14%
24%
129
flagPoland
37%
21%
15%
26%
1485
flagthe United Kingdom
33%
25%
16%
25%
24
flagthe United States
25%
41%
16%
16%
24
flagSwitzerland
20%
20%
10%
50%
10
flagAustralia
14%
42%
42%
0%
14
flagGreece
8%
58%
8%
25%
12