What is the color of the light on preferred-channel buoys?

Preferred-channel buoys are used in navigation to indicate the direction of safe passage through a waterway. The color of the light on these buoys is significant because it helps mariners understand which side of the buoy to pass. Specifically, these buoys are often equipped with both red and green lights, which serve as a visual guide for the captain's navigation.

Red indicates the left side when approaching from the sea, while green indicates the right side. The combination of both colors allows for clear identification of the safe channel, reducing the risk of grounding or collision. Understanding the color scheme of preferred-channel buoys is essential for boat operators, as it plays a crucial role in safe navigation through potentially hazardous waters.