What is the significance of a black buoy with red horizontal bands?

A black buoy with red horizontal bands is specifically designed to mark an isolated danger. This means that there is a hazard that is surrounded by navigable water, such as a submerged rock or a wreck. The distinct color pattern of black with red bands makes it easily recognizable to mariners, alerting them to navigate carefully and keep a safe distance from the danger marked by the buoy.

In the IALA Maritime Buoyage System, buoys are color-coded and patterned to provide clear information about maritime navigation. Black buoys often signify hazards, and the addition of red bands clearly communicates that there is an isolated danger in the vicinity. Recognizing and understanding these color patterns is crucial for safe navigation at sea.