You are operating a powerboat at night you see only green light on the boat what does the light tell you?

If you see only a green light on another boat at night, it indicates that the vessel is facing you and is likely a powerboat or a sailing vessel under power. The green light is part of the standard navigation lights and signifies the starboard (right) side of the boat. This means you should give way to the other vessel, as you are on its port (left) side. Always maintain a safe distance and be prepared to take evasive action if necessary.