The GIOVE Processing Centre in the Radio Navigation Laboratory of ESTEC, ESA's technical centre in Noordwijk, the Netherlands. The GPC crunched all the raw measurement data from the worldwide GIOVE ground stations to produce an hourly-updated summary of both (now retired) GIOVE satellites’ clocks and current orbits, as well as the ground stations’ own atomic clocks. This information was then passed on to the control centres of the two satellites: Guildford in the UK for GIOVE-A, Fucino in Italy for GIOVE-B, where it could then be uploaded to the satellites.