The ERSAT GGC project aims to certify EGNSS resources according to the ERTMS standard. The ERSAT program (ERtms + SATellite) was started in 2012 by the Italian Rail Infrastructure Manager RFI in collaboration with Ansaldo STS for the integration of satellite technologies on the ERTMS platform. The primary objectives of ERSAT GGC are to allow RFI, recently nominated as Game Changer, to integrate satellite technology into ERTMS, commissioning an operational line by 2020, the same year in which Galileo services will be operational, and to accelerate the standardisation process at European level to include satellite requirements in the new ERTMS TSI TSI (Technical Specification for Interoperability).