Plain English Meaning

A small radio beacon located along the final approach path, several miles from the runway, that helps pilots find and line up with the runway during an instrument approach.

Full Definition

A Locator Outer Marker is a low-power non-directional beacon (NDB) installed at or near the outer marker position of an instrument landing system (ILS) approach. It provides bearing information that helps pilots intercept and track the final approach course toward the runway, and traditionally marked the point where the glideslope is intercepted at the published .