Question 479 Rules of the Road

90% to pass

INTERNATIONAL ONLY Two power-driven vessels are meeting. What would a two blast whistle signal by either vessel mean?

A "I am altering course to port"
B "I desire to pass port to port"
C "I desire to pass starboard to starboard"
D "I intend to alter course to port"
AI Explanation

The correct answer is A) "I am altering course to port". According to the International Regulations for Preventing Collisions at Sea (COLREGS), a two-blast whistle signal by either vessel in a meeting situation indicates that the vessel is altering course to port. This signals the other vessel that it should also alter course to port to pass port-to-port, as the preferred method for power-driven vessels meeting head-on. The other options are incorrect because they do not accurately reflect the meaning of the two-blast whistle signal in a meeting situation. Options B, C, and D do not correctly describe the intended action of the vessel sounding the whistle.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG Navigation Center
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