What is the difference between NDB and DME?

NDB (Non-Directional Beacon) and DME (Distance Measuring Equipment) are both navigational aids used in aviation. An NDB provides a radio signal that pilots can use to determine their bearing to the station, but it does not provide distance information. In contrast, DME measures the distance from the aircraft to the ground station by timing the transmission of signals. While NDBs assist with directional navigation, DMEs provide crucial distance data, enhancing overall navigation accuracy.