Description / Abstract: The document contains Minimum Operational Performance Standards (MOPS) for airborne navigation equipment using signals from the Global Navigation Satellite System (GNSS) augmented by a Ground-based Regional Augmentation System (GRAS). The document defines minimum performance requirements, functions and features for GRAS airborne equipment to support all phases of flight including en-route, terminal, LNAV (Lateral NAVigation), LNAV/VNAV (Lateral NAVigation/Vertical NAVigation), LP (Localizer Approach with FAS data but without vertical guidance), LPV (Localizer Precision with Vertical guidance) (but not CAT-I/II/III). GRAS equipment will be compatible with the Ground Based Augmentation System (GBAS) and will be able to use the signal in space for approved approach operations. Compliance with these standards by manufacturers, installers and users is recommended as a means of assuring that the equipment will satisfactorily perform its intended functions under conditions encountered in routine aeronautical operations.