Question 590 Rules of the Road

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BOTH INTERNATIONAL & INLAND Which vessel would turn off its sidelights?

A a vessel trolling underway
B a vessel that is making way, not under command
C a vessel that is not under command, not making way
D a vessel that is underway but not making way
AI Explanation

The correct answer is C) a vessel that is not under command, not making way. According to the International Regulations for Preventing Collisions at Sea (COLREGS), a vessel that is not under command and not making way should display all-round red and white lights instead of sidelights. This is specified in Rule 27(b) of the COLREGS. The other answer choices do not meet this requirement, as a vessel that is trolling underway (A), making way but not under command (B), or underway but not making way (D) would still be required to display sidelights.

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