What defines a Major Light in navigation?

A Major Light in navigation is defined as a high intensity and reliable light typically exhibited from a fixed structure or marine site. These lights serve a crucial role in aiding mariners with safe navigation by marking significant points, such as harbor entrances, reefs, or hazards. The characteristics of a Major Light ensure that it can be seen from great distances, providing a dependable point of reference even in challenging visibility conditions, making it an essential part of maritime navigation systems.

In contrast, the other options describe lights with different purposes or characteristics. Low-intensity lights are generally used for marking smaller navigational aids, such as buoys, and do not possess the same visibility range as Major Lights. Temporary lights displayed on vessels serve specific short-term navigational needs, rather than providing the continuous, reliable guidance offered by Major Lights. Finally, visual signals that indicate weather conditions do not pertain to navigational lights and serve an entirely different function related to meteorological updates rather than maritime navigation.