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DISTRESS SIGNALS
When a vessel is in distress and requires assistance the following signals may be used or displayed, either together or separately:-
A gun or explosive signal fired at intervals of one minute.
A continuous sounding of the fog siren or signal.
Rockets or shells throwing red stars fired one at a time at short intervals.
A smoke signal giving off a volume of orange coloured smoke.
The International Code Signal of distress NC, flags or sound signal
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A signal consisting of a square or anything resembling a square having above or below it a ball or anything resembling a ball.
A spoken radio message using the "Mayday" procedure.
Slowly and repeatedly raising and lowering the arms outstretched from side to side.
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