It used to be simple: There were „non-precision“ and „precision“ approaches. But things have changed quite a bit. The advent of performance based navigation (PBN) is only one aspect that comes into play here. Over the years, many new technologies and techniques have been developed and it is time for a “terminology cleanup”. New approach classifications have been established in ICAO Annex 6 [1]: Type A: a minimum descent height or decision height at or above 75 m (250 ft); Typ