What is meant by the term "waypoint" in navigation?

A waypoint in navigation refers to a specific location or point used to mark a route on a navigational chart. Waypoints are crucial in both maritime and aerial navigation as they help in determining a path between two locations. These points can be defined using coordinates, and they assist navigators by providing reference points that facilitate efficient route planning and navigation. By identifying waypoints, navigators can accurately track their positions, make necessary adjustments to their courses, and ensure they stay on the intended path, especially in complex navigation situations or when visibility is limited.

The other options do not accurately describe waypoints. An emergency signal marker refers to devices or signals used to alert others in case of distress, which serves a different purpose than the navigational function of waypoints. A traffic control point pertains to a designated area where vessels may be directed to regulate movement, which is not the same as specifying a route. A type of navigational instrument refers to tools used in navigation, such as compasses or GPS devices, rather than the concept of a waypoint itself.