What is a white with black top spar buoy?

A white with black top spar buoy is a type of navigational buoy used in maritime environments to mark channels, hazards, or mooring areas. The coloration typically indicates a specific meaning based on maritime navigation rules; for instance, a white buoy with a black top often signifies a safe water mark or a lateral mark. These buoys are designed to be easily visible to mariners, helping to ensure safe navigation. The spar design allows them to remain upright in various water conditions.