In sailing and navigation, range generally refers to the alignment of two or more objects to form a direct line of position. This technique is used to safely navigate channels or to determine the exact position of a boat.

Key Definitions of "Range" in Sailing
Navigational Range (Transit): Two or more fixed objects (such as beacons, towers, or lighthouses) that are aligned vertically. When the observer sees the inland, higher object directly above the forward, lower object, the vessel is on the designated, safe course.

Natural Range: The alignment of two charted, but non-navigational, objects (such as a corner of a pier aligned with a church spire) used for a fix.

Visual Range: The maximum distance at which a light or object can be seen by the eye, limited only by the curvature of the earth (geographic range) or the intensity of the light and atmospheric conditions (luminous range).

Range of Tide: The vertical difference in height between high water and the preceding or following low water.

Operating Range (Cruising Radius): The maximum distance a vessel can travel at a given speed without needing to refuel.