Plain English Meaning

These are older approaches that were originally flown using ground-based radio aids, but have been re-approved so a pilot can fly the exact same path using GPS instead.

Full Definition

Instrument approach procedures originally designed around a ground-based navigation aid (such as VOR, NDB, or TACAN) that have been republished to allow GPS to be used as the primary means of navigation along the same approach path. The procedure title carries the suffix 'or GPS' (legacy) or is published as a standalone GPS approach that replaces the original. The lateral path, fixes, and minimums are essentially the same as the underlying ground-based procedure.