What is indicated by flashing green lights on a buoy?

Flashing green lights on a buoy indicate that it is a horizontally banded buoy. These buoys are used as lateral markers in navigational aids, specifically to indicate to vessels that they are navigating in the direction where the green light is visible. This light can help mariners to orient themselves properly when on the water, especially during low visibility conditions.

The configuration of these buoys, with a horizontal band, is significant in maritime navigation. It helps to differentiate them from other types of navigation buoys, which might have different light sequences or colors to indicate various navigational instructions. Understanding the specific cues provided by buoys is crucial for safe navigation, as they help in identifying safe passages or hazards.