What does the red navigation light indicate on a vessel?

The red navigation light indicates the port side of the vessel. In maritime navigation, vessels are required to display colored lights to help identify their position and orientation relative to other vessels, especially during nighttime or in poor visibility conditions. The lights are standardized: a red light is always used on the port side (the left side when facing forward), while a green light indicates the starboard side (the right side).

This system of color coding helps other boaters identify the direction a vessel is facing and has the right of way. Therefore, seeing a red light suggests that the observer is looking at the port side of another vessel. Understanding these lights is essential for safe navigation on the water, as it allows boat operators to make informed decisions when approaching or passing other vessels.