Question 20Navigation General

70% to pass

Buoys which only mark the left or right side of the channel will never exhibit a light with which characteristic?

A Flashing
B Composite group flashing
C Quick flashing
D Equal interval (isophase)
AI Explanation

The correct answer is B) Composite group flashing. Buoys that mark the left or right side of a channel (lateral markers) will never exhibit a composite group flashing light characteristic. This is because the composite group flashing pattern is reserved for special purpose buoys, such as those marking wrecks or obstructions, not for standard lateral channel markers. The other answer choices are incorrect because flashing (A), quick flashing (C), and equal interval (isophase) (D) are all light characteristics that can be used on lateral channel marking buoys.

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