What is a VOR and its use in navigation?

A VOR, or Very High Frequency Omnidirectional Range, is a type of radio navigation system used by pilots to determine their aircraft's position and direction relative to a series of ground-based radio beacons. The VOR system works by providing aircraft with a reliable signal that allows them to navigate by tuning into specific frequencies emitted by these beacons. Pilots can use the VOR to establish their position with respect to the station, allowing for precise navigation along airways and to destinations.

The VOR system is crucial for en route navigation and assists pilots in following established air routes where direct navigation would otherwise be challenging. By interpreting the radial emitted from a VOR station, pilots can determine their heading and make adjustments as needed to stay on course or reach their intended destination.

This functionality is distinct from the other choices listed. For instance, a type of weather radar is used for detecting weather patterns rather than navigating, while ground control systems for aircraft refer to assistance provided during takeoff and landing rather than in-flight navigation. An airspeed indicator, on the other hand, measures how fast an aircraft is moving through the air, which is unrelated to the navigation capabilities provided by a VOR system.