What is the function of a VOR?

A VOR, or VHF Omnidirectional Range, is a type of radio navigation system that enables aircraft to determine their position relative to a VOR station. The primary function of a VOR is to provide precise navigation information to pilots. It achieves this by broadcasting radio signals in all directions, which aircraft can receive and use to establish their bearing from the station.

Pilots can read the information from the VOR instrument in their aircraft to determine specific radials to or from the station, allowing them to navigate accurately along defined flight paths. This is particularly useful in conjunction with instrument approaches, airways, and en route navigation.

In contrast, the other options do not align with the core capabilities of a VOR. Monitoring weather conditions is typically handled by other systems such as AWOS (Automated Weather Observing Systems) or ASOS (Automated Surface Observing Systems). The role of a communication relay is served by different types of avionics and communication systems, not VORs. Lastly, fuel level indicators are part of the aircraft's fuel management systems, separate from navigation instruments like a VOR.