What is the primary function of a light on a buoy?

The primary function of a light on a buoy is to help identify the buoy's type and status. Lights are essential elements of the IALA Maritime Buoyage System, as they convey important information to mariners at night or during poor visibility conditions. Each buoy has a specific light color, rhythm, and pattern that signals its meaning and role in navigation. By being able to identify these characteristics, mariners can understand the navigational hazards, sea routes, and safe entry points.

While illumination may seem useful for providing light in general, the main purpose of the light isn't to illuminate waters for navigation in a traditional sense but rather to communicate specific information regarding the buoy itself. This helps vessels maintain safe distances and adhere to navigational rules effectively, enhancing maritime safety.