The elements that make up the EGNOS system include: RIMS (Ranging and Integrity Monitoring Stations) which pick up the GPS signals, the MCCs (Master Control Centres) to process the data delivered by the RIMS and uplink stations which send the signal to three geostationary satellites which relay it back to the ground to the users. Deployments so far include 12 RIMS and one MCC (in Langen, Germany).