What is a waypoint in the context of aviation navigation?

A waypoint is a predefined geographical location that is used in aviation navigation to help pilots navigate along a flight route. Waypoints are typically defined by specific coordinates (latitude and longitude) and may correspond to visual landmarks, navigation aids, or simply a point in space that is significant for flight planning, navigation, and situational awareness.

Waypoints provide a structured way for pilots and air traffic control to communicate about position, route adherence, and intended flight paths. They can be used in conjunction with various navigation systems, such as GPS, to ensure accuracy and help manage air traffic efficiently.

The other options describe different concepts relevant to aviation but do not accurately capture the definition of a waypoint. For example, decision points pertain to critical moments in flight where pilots must make operational choices, specific altitudes relate to vertical positioning rather than location, and communication frequencies are related to radio operations instead of geographical referencing.