EGNOSEuropean Geostationary Navigation Overlay Service is divided into four functional segments:

1) The ground segment is composed of the following stations/centres which are mainly distributed in Europe and are interconnected between themselves through a land network.

• 34 Ranging and Integrity Monitoring Stations (RIMSRanging and Integrity Monitoring Station or Remote Integrity Monitoring Station) + seven being deployed: receive the satellite signals and send this information to the MCCMaster Control Centre centres.
• 4 MCCMaster Control Centre (control and processing centres) receive the information from the RIMSRanging and Integrity Monitoring Station or Remote Integrity Monitoring Station stations and generate correction messages to improve satellite signal accuracy and information messages on the status of the satellites (integrity). The MCCMaster Control Centre acts as the EGNOSEuropean Geostationary Navigation Overlay Service system 'brain'
• 6 NLESNavigation Land Earth Station (stations that access the geostationary satellites): they receive the correction messages from the CPFs for the upload of the data stream to the geostationary satellites and the generation of the GPSGlobal Positioning System-like signal. This data is then transmitted to the European users via the geostationary Satellite

2) EGNOSEuropean Geostationary Navigation Overlay Service support segment. In addition to the previously mentioned stations/centres, the system has other ground support installations that perform the activities of system operations planning and performance assessment.

3) The Space Segment is composed of three geostationary satellites:

• Two Inmarsat III satellites.
• One Artemis satellite from the European Space Agency.

4) User segment: set of EGNOSEuropean Geostationary Navigation Overlay Service ( or SBASSatellite Based Augmentation System) receivers developed for various types of users.

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