What does it indicate if you only see a green light while boating at night?

Seeing a green light while boating at night typically indicates that you are approaching a sailing vessel. In maritime navigation, vessels are required to display specific colored lights to signify their position and movement. A green light indicates the starboard (right) side of a vessel. If you see this light alone, it suggests you are likely nearing a sailing craft that is underway and having navigational lights on.

In contrast, if you were approaching a powerboat, you might see both red and green lights, signifying the front view of the vessel. Seeing a marker would usually present a fixed light rather than one on a moving object. Additionally, a no-wake zone is not determined by the visibility of lights; it's more related to local regulations regarding speed in certain areas.