This standard specifies the minimum performance expected from GPS / Galileo / SBAS dual-frequency L1/L5 airborne equipment. This initial issue is focused on equipment processing signals broadcast by GPS satellites, Galileo satellites and geostationary SBAS satellites providing correction and integrity data, but no ranging data. It is meant to support prototyping activities linked to the SBAS L5-provided integrity monitoring capability with a Class Beta-like equipment, then evolve into a complete MOPS enabling the development of certified avionics.