Rules of the Road · Maneuvering & Warning Signals
A vessel in doubt about whether another vessel's actions are sufficient to avoid collision should sound which signal under Rule 34(d)?
- AOne prolonged blast
- BTwo prolonged blasts followed by one short blast
- CAt least five short and rapid blasts on the whistle✓ Correct
- DOne prolonged blast followed by two short blasts
Explanation
Rule 34(d) prescribes at least five short and rapid blasts as the doubt or danger signal. This can be supplemented by at least five short and rapid flashes of a light. It is used when a vessel is in doubt about the sufficiency of action being taken to avert collision.
Authority: 72 COLREGS Rule 34(d)
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