What visibility requirement must all vessels meet when anchored or moored during nighttime?

All vessels that are anchored or moored must exhibit a white light that is visible from all directions during nighttime. This requirement is crucial for safety on the water, as it allows other vessels to see the anchored or moored vessel from any angle. This visibility reduces the risk of collision and helps ensure that all waterway users can navigate safely.

The white light serves as a marker to signal the vessel's presence, providing necessary information to other boaters, including those approaching from various directions. Thus, meeting this visibility requirement is essential for both the safety of the vessel and the surrounding vessels in the area.