Plain English Meaning
An approach where one signal keeps you lined up with the runway and a distance reading tells you how far you are from it. You step down to lower altitudes at specific distances rather than following a glideslope down.
Full Definition
A non-precision instrument approach that uses a localizer for lateral (left/right) guidance to the runway and DME (Distance Measuring Equipment) to identify fixes, step-down points, and the missed approach point along the final approach course. It does not provide vertical (glideslope) guidance, so the pilot descends through published based on DME distances.