What should you do if you see only a green light while boating at night?

If you see only a green light while boating at night, you should give way. This is because a green light indicates the presence of a vessel that is either on your right side or is facing towards you from your starboard side. According to maritime navigation rules, you must yield to other vessels if you are approaching another boat, particularly if they are displaying the green light, which is typically associated with a powered or sailing vessel under way.

The reason giving way is crucial in this scenario is to prevent potential collisions at night when visibility may be limited. Observing navigation lights helps you understand the positions of other boats, so recognizing a green light signifies that you must take action to ensure safety on the water. Maintaining speed and course, approaching with caution, or turning back would not adequately address the need for safety and the right of way established by navigation rules.