A buoy may show only which type of light?

A buoy may show only flashing red lights as a specific characteristic to signify its purpose in navigation. Flashing red lights are commonly used to indicate a navigational hazard, mark a dangerous area, or denote the presence of a wreck or other obstruction in specific waters. This color and flash pattern communicate critical information to mariners, signaling caution or indicating specific navigational rules.

In maritime navigation, different light characteristics are tied to various navigational aids, and the use of red lights, especially when flashing, is standardized to help in assessing the buoy's message quickly and effectively. Other color lights, such as steady white and flashing green, have different meanings or uses associated with navigation, indicating different types of buoys or marks. Flashing blue lights are generally not used in buoy navigation at all. Understanding these conventions leads to safer navigation practices on the water.