DME stands for?

• A. Distance and Motion Encoder
• B. Distance Measuring Equipment
• C. Digital Measuring Entity
• D. Direct Measuring Engine

Answer: (B)

Distance Measuring Equipment is the standard term used in aviation navigation. DME is a ground-to-air radio navigation aid that measures how far the aircraft is from a DME station. It works by the aircraft sending a signal to the ground station, which replies, and the system calculates distance from the round-trip time of the signal. The result is shown as distance in nautical miles, commonly paired with VOR as VOR/DME so pilots can determine position by bearing and range. The other phrases aren’t recognized navigation terms, so they don’t fit how this acronym is used.