Question 131Navigation General

The correct answer is C) special purpose mark. According to the U.S. Aids to Navigation System, a yellow buoy is used to indicate a special purpose mark. Special purpose marks are used to indicate a special area or feature, such as a traffic separation scheme, anchorage area, or offshore structure. They are not used to indicate the safe navigable waters, as is the case with safe water buoys (answer B), nor do they serve as cardinal marks (answer D) to indicate the direction of safe water. Junction buoys (answer A) are colored differently, using a combination of red and green.