Which buoy type represents a special purpose in navigation?

The emergency wreck buoy is a special purpose navigation aid designed to indicate the location of a sunken vessel or other underwater hazard. This type of buoy serves a critical role in ensuring safe navigation by alerting mariners to potential dangers that may not be visible from the surface, thus allowing vessels to navigate around these hazards.

Special purpose buoys, like the emergency wreck buoy, provide specific information that is vital for maritime safety, particularly in case of emergencies where a wreck may pose a threat to other vessels in the area. The signal and purpose of these buoys are clearly defined, ensuring that they can be recognized quickly by mariners.

Understanding the role of special purpose buoys is crucial for effective navigation and safety at sea, as they contribute to the overall navigational aids that help guide vessels safely around hazards.