Question 209Navigation General

70% to pass

Under the U.S. Aids to Navigation System, a lighted buoy with a spherical topmark marks _______________.

A the port side of the channel
B the position of underwater cables
C a hazard to navigation
D safe water
AI Explanation

The correct answer is D) safe water. According to the U.S. Aids to Navigation System, a lighted buoy with a spherical topmark marks safe water, which is the deepest part of the channel or fairway where vessels can safely navigate. The spherical topmark is a distinct visual cue that helps mariners identify this type of buoy. The other answer choices are incorrect because: A) port-side markers have a different shape (can or nun), B) underwater cables are not typically marked with buoys, and C) hazards to navigation are marked with different topmarks, such as a conical or pillar shape.

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