ABSTRACT
Closely related with the principle of compatibility of GNSS with the Chicago Convention is the issue of certification. Like all air navigation facilities, GNSS requires certification by the relevant authorities to ensure compliance with navigation performance requirements related to the safety of international civil aviation.1 Therefore an adequate system of ICAO SARPs on GNSS should not only cover the performance criteria of avionics and ground facilities, training and licensing requirements, but also satellite components and signal-in-space, as well as the system as a whole.2
