During periods of restricted visibility, navigation lights must be displayed:

Navigation lights are essential for maintaining safety on the water, particularly during times of restricted visibility. The requirement to display navigation lights at all times ensures that vessels can be seen by others, which reduces the risk of collisions. This is crucial not only at night but also during fog, rain, or any other condition that limits visibility.

By using navigation lights consistently, boat operators provide clear indicators of their position, size, and direction, allowing other vessels to take necessary precautions to avoid accidents. It is important to note that visibility can be unpredictably altered by various environmental conditions, and having navigation lights on at all times while underway minimizes the risks associated with these challenging situations. Thus, regardless of whether it is day or night or the type of weather, navigation lights should always be in use when visibility is compromised.