What indicates a dual purpose buoy?
Official USCG Answer & Rule Citation
Correct Answer: Option D — Green buoy with a yellow square
A green buoy with a yellow square indicates a dual purpose marking under the US Aids to Navigation System (USATONS). These marks are used where the Intracoastal Waterway (ICW) and other conventional waterways coincide, serving both lateral systems simultaneously without conflicting guidance.
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