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

The primary purpose of Distance Measuring Equipment (DME) is to provide distance data to pilots. DME operates by measuring the slant range distance of an aircraft from a DME ground station, allowing pilots to determine their distance from the station in nautical miles. This information is crucial for navigation, enabling pilots to make informed decisions regarding their flight path, altitude, and approach to airports.

Interpreting the distance information provided by DME is instrumental for pilots, particularly in scenarios such as en-route navigation, approaches to land, and distance-based altitude assignments. The accurate distance data helps enhance situational awareness and fuel efficiency during flight operations.

The other options relate to different functions or uses in aviation; tracking flight paths, enhancing safety during landings, and offering weather advisories involve distinct systems and technologies. DME's sole focus is on providing distance measurements, making it a vital tool for navigation but not specifically for those other purposes.