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

The function of Distance Measuring Equipment (DME) is to measure the distance between the aircraft and the DME ground station. This is achieved through the use of radio signals, where the equipment calculates the distance based on the time it takes for a signal to travel from the aircraft to the station and back again. DME provides pilots with valuable information that helps in navigation, especially in conjunction with other navigation aids like VOR (VHF Omnidirectional Range).

By using DME, pilots can determine their position relative to the DME ground station and maintain the desired course or approach path. This distance measurement is critical for safe operations, particularly in controlled airspace and during instrument approaches. Thus, the ability to ascertain the distance to a reference point enhances situational awareness and aids in precise navigation.