When maintaining course while approaching another vessel, which light would you expect to see on the starboard side?

When maintaining course while approaching another vessel, seeing a green light on the starboard side indicates that you are approaching a power-driven vessel that is also maintaining its course. According to the navigation rules, a vessel’s navigation lights are color-coded to indicate its position and the direction it is facing.

The green light is specifically used on the starboard (right) side of a vessel. When you see this light, it implies that the vessel's bow is pointed away from you, meaning you are likely to have the right-of-way and that the other vessel is proceeding in a way that does not pose a collision risk, as long as both parties maintain their courses.

In contrast, the red light is used to indicate the port (left) side of a vessel, while white lights can signify various navigation statuses, such as anchor lights or stern lights, and yellow is not commonly used for navigation lights on recreational vessels. Therefore, seeing a green light is a clear indication of the vessel's direction and helps in determining your navigation decisions accordingly.