Plain English Meaning
An instrument approach you fly using GPS by itself, with no need to tune in a ground station. The chart will be titled 'RNAV (GPS) RWY' followed by the runway number.
Full Definition
An instrument approach procedure designed to be flown using GPS as the sole primary navigation source, without requiring any ground-based navigation aid (such as VOR, ILS, or NDB) to fly the final approach segment. These approaches are charted as 'RNAV (GPS) RWY XX' and provide lateral guidance, and in many cases vertical guidance, derived entirely from -based positioning. The must be equipped with an - that meets the appropriate TSO , and the may include , , , or LP lines depending on the 's capability and the procedure design.