What is the primary function of Distance Measuring Equipment (DME)?

The primary function of Distance Measuring Equipment (DME) is to provide aircraft-to-station distance. DME operates by measuring the distance between an aircraft and a ground station by sending out a signal, which the aircraft then receives and uses to calculate the range. This information is vital for navigation and helps pilots determine their position relative to the station, aiding in approach and landing procedures.

This functionality is critical in aviation as it improves situational awareness and helps maintain safe distances during flight. While other options may refer to different aviation technologies, they do not pertain to the specific role of DME in measuring distance.