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IALA
COLREG
COLREG
IALA
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GMDSS
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EN
ES
CA
DE
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IT
PT
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EL
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PT-BR
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20:00
One short blast on the whistle means:
A
I am altering course to port
B
I am altering course to starboard
C
I am operating astern propulsion
D
I am in distress