In avionics, what is 'DME' used for?

In avionics, DME stands for Distance Measuring Equipment. It is used primarily to determine the distance between an aircraft and a ground station. This system operates by sending a signal from the aircraft to the DME ground station, which then responds with a signal back to the aircraft. The time taken for this round-trip signal helps calculate the precise distance from the aircraft to the ground station, allowing pilots to navigate more effectively.

This function is critical for situational awareness during approaches and landings, as well as in en route navigation. By providing accurate distance information, DME plays a vital role in ensuring safe distances are maintained from navigational aids, contributing to overall flight safety. The other options refer to different functions within aviation that do not specifically pertain to distance measurement. For instance, managing equipment failures relates to maintenance systems, weather updates would involve meteorological services, and ground communications are handled by other communication systems. Therefore, the correct understanding lies in DME's specific role in distance measurement.