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

Seeing only a green light on another boat at night indicates that the vessel is likely facing towards you and is on your starboard (right) side. In navigation, a green light signifies the starboard side of a vessel, while a red light indicates the port side. This means you should give way to the other boat, as it has the right of way. Always ensure to maintain a safe distance and navigate cautiously.