Navy OCS Navigation Practice Test

A black and red buoy indicates an isolated danger, which is a buoy marking a specific hazard in the water that boaters should avoid. These buoys are used to alert mariners of dangers such as submerged rocks, wrecks, or other hazards that are not immediately visible. The coloration—black on top and red on the bottom—helps to identify it quickly and differentiate it from other types of buoys that convey different navigational information. Recognizing these buoys is essential for safe navigation, as they indicate areas where caution is needed to avoid accidents.