Rules of the Road · Maneuvering & Warning Signals
A power-driven vessel in sight of another vessel alters course to starboard. What whistle signal is required under Rule 34?
- ATwo short blasts
- BThree short blasts
- COne short blast✓ Correct
- DOne prolonged blast
Explanation
Rule 34(a)(i) requires one short blast to mean 'I am altering my course to starboard.' Two short blasts signal a port alteration. Three short blasts signal engines going astern. This signal is used only when vessels are in sight of one another.
Authority: 72 COLREGS Rule 34(a)(i)
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