If you see only a green light or a red light on a vessel, what action should you take?

Seeing only a green light or a red light on a vessel indicates that you are approaching another vessel at night, and this typically means the other vessel is underway. The presence of just one color light signifies which side the other vessel's bow is facing, and it is important to understand the implications of this as it relates to right-of-way rules.

If you see a red light, it means you are looking at the port side of another vessel, whereas a green light indicates you are looking at its starboard side. In both cases, you must give way because you are likely crossing paths with the other vessel. These lights serve to help navigators determine the direction in which the other vessel is moving and understand how to safely maneuver to avoid a collision. Giving way aligns with maritime navigation rules, particularly the "Stand-on" and "Give-way" vessel regulations.

The other options do not align with safe boating practices. Passing on either side without understanding whether you have the right of way could lead to dangerous situations. Approaching closely without knowing whether it is safe could put you at risk of collision. Assuming a stationary vessel is harmless is misleading because, without understanding its movement through lights, you may misjudge your navigation. Thus, giving way when you see