Defines the antenna performance for antennas that will be used with GNSS receiver equipment. Contains Minimum Operational Performance Standards (MOPS) for GNSS airborne antenna equipment designed to use GPS or GLONASS augmented by other systems/equipment/techniques as appropriate to meet the performance requirements for primary means of navigation for en route@ terminal@ non-precision@ and precision approach phases of flight. Incorporated within these standards are equipment characteristics that should be useful to users@ designers@ manufacturers@ and installers of equipment.