A buoy's purpose can often be identified by which characteristic?

The purpose of a buoy is often identified by its color because specific colors are associated with particular functions in navigation. For example, red buoys typically indicate the right side of a channel when returning from sea, while green buoys indicate the left side. This color-coding system helps mariners quickly understand their positioning relative to safe navigational routes, aids, and hazards.

Knowing the color and the associated meanings is critical for safe navigation on the water. While sound signals, material, and size may provide additional information about a buoy, color is the most straightforward and universally understood indicator of its purpose. This characteristic is essential for quick recognition and decision-making while operating vessels.