What is the top mark of a safe water buoy?

The top mark of a safe water buoy is a single sphere. Safe water buoys are used to indicate that there is safe water all around, and their distinctive single spherical top mark helps mariners quickly identify them. This design is part of the International Association of Lighthouse Authorities (IALA) buoyage system, which standardizes buoy shapes and markings for uniformity in navigation.

The single sphere at the top of a safe water buoy is easily recognizable from a distance, ensuring that it serves its purpose effectively as a navigational aid. The buoy itself is typically colored red and white in a vertical striped pattern, reinforcing its identity as a safe water mark. This specific design and marking system is essential for navigation safety, helping to prevent collisions and grounding in waterway traffic.