You are sailing south on the Intracoastal Waterway (ICW) when you sight a red nun buoy with a yellow square painted on it. Which of the following is TRUE?

Correct Answer: Option D — You should leave the buoy on your port hand.

The ICW uses yellow symbols to distinguish its channel from local lateral marks. A yellow square on a red buoy indicates that the buoy must be left to port when proceeding south. This specific marking system is detailed in the U.S. Coast Guard Light List and Coast Pilot publications.