If you see a red, green, and white light on a vessel, what does it indicate?

The presence of a red, green, and white light on a vessel indicates that you are likely seeing a vessel that is underway and may be approaching a situation where both vessels could potentially be on a collision course. In navigational terms, a red light typically indicates the port (left) side of a vessel, while a green light indicates the starboard (right) side. The white light generally points to the stern (rear) of the vessel.

When you see this combination of lights, it signifies that both vessels are active and in motion. According to the rules of the road, when two power-driven vessels are approaching each other, the vessel displaying the red light must give way to the one displaying the green light, meaning that it is crucial for you to give way as well, ensuring safe navigation and minimizing the risk of collision. This is an essential rule of boating safety, reflecting the importance of understanding navigation signals to promote safe practices on the water.