Satellite Based Augmentation Systems (SBAS) provide a high level of accuracy over a wide area (in contrast to GBAS, which provides accuracy to a small area), using satellites to send correction data to the aircraft. There are four systems under operation, which work on the same basic principle. One of them is the European Geostationary Navigation Overlay System (EGNOS) in Western Europe and the Mediterranean.

EGNOS uses three geostationary INMARSAT (International Maritime Satellite Organisation) satellites, which broadcast GPS signals, provide horizontal accuracy of around 0.7 m and vertically around 1.1 m and it, also, alerts users within 6 seconds if a GPS malfunction occurs.

LPV is a 3D approach with vertical guidance (APV), like a conventional ILS, but using GNSS augmented by SBAS, with no barometric input.

According to the NOTAM, the EGNOS system, which is an SBAS system, is not available for LPV approaches, thus for LPV minima.