Question 388Navigation General

70% to pass

The channel under a bridge is marked with lights of the lateral system. The centerline of the channel shall be marked on the bridge by _______________.

A a flashing blue light
B an occulting white light
C three fixed white lights
D a yellow light
AI Explanation

The correct answer is B) an occulting white light. The centerline of a navigable channel under a bridge is typically marked with an occulting white light. This is in accordance with the U.S. Aids to Navigation System, which specifies that the centerline of a navigable channel shall be marked by an occulting white light. The other options are incorrect because: A) a flashing blue light is used to mark the location of a bridge pier or obstruction, not the centerline; C) three fixed white lights are not the standard marking for a channel centerline; and D) a yellow light is not used for this purpose in the lateral marking system.

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