What does a fixed light indicate in navigation aids?

A fixed light indicates a steady illumination that remains constant without any variation in intensity, making it a reliable point of reference for navigators. This type of light is typically used in buoys, lighthouses, and other navigational aids to signify a specific location. The steady nature of the light helps mariners identify their position or navigate a particular route without confusion, as the fixed light provides a stable visual cue that can be seen from a distance.

In contrast, other types of lights indicate different characteristics. A flashing light would alternately turn on and off in a regular pattern. A light that alternates in brightness may have variations in intensity, which can indicate different messages or statuses. Lastly, lights that change color can be used to convey a change in navigational instructions or to signify different statuses or hazards. Thus, the definition and purpose of a fixed light is clearly distinguished by its unwavering, steady illumination.