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

The primary purpose of Distance Measuring Equipment (DME) is to assist pilots in determining their distance from a specific point, typically a navigation aid or an airport. This capability is crucial for navigation and can effectively replace marker beacons that traditionally served a similar purpose by providing distance information, which helps pilots navigate and maintain proper spacing during their approach and landing phases.

While tracking aircraft position globally is associated with systems like GPS, and monitoring weather conditions is the function of various weather radar systems, DME specifically focuses on distance measurement to enhance air navigation. Additionally, common approach information is typically provided through instrument landing systems (ILS) or other approach aids, which do not serve the distinct function that DME provides.