What is the definition of a range in maritime navigation?

In maritime navigation, a range is specifically defined as a straight line down the center of a channel when following a true course. This concept is crucial for ensuring safe navigation, as it helps mariners to align their vessels properly while moving through narrow or constrained water areas. Ranges are used in conjunction with two or more fixed points, such as buoys, lights, or other landmarks, allowing mariners to visually align their heading and maintain a safe passage.

The importance of this definition lies in its application to navigation practices, enabling captains to ascertain their position relative to navigational hazards and channel boundaries. By maintaining a course that aligns with the range, a vessel can safely navigate without straying into shallow waters or other dangers. This understanding is vital for both day and night navigation, as ranges can often include lighted navigational aids that reinforce the path to be followed.

While other options may contain elements of navigation, they do not accurately capture the specific definition of a range, which is primarily about the alignment to follow a safe channel rather than merely being a lateral guide, a distance measurement, or simply a navigational aid on land.