Introduction

Galileo is the European Union’s global satellite navigation system. It is Europe’s own independent GNSS and is designed to provide highly accurate navigation and timing services under civilian control. ESA describes it as Europe’s independent satellite navigation system, while EU sources emphasize its global reach and strategic autonomy.

Nature of the system

Galileo is a global system, not a regional one. It is significant because it is explicitly a civilian-controlled global navigation system, which differentiates it politically from systems that emerged primarily through military programmes. This civilian-control principle is one of Galileo’s defining features.

Constellation and orbit

ESA states that the current Galileo system consists of 28 satellites in total. All but two are positioned in three circular Medium Earth Orbit planes at an altitude of about 23,222 km and an inclination of 56 degrees to the equator. ESA also notes that two satellites were placed in incorrect orbits by an earlier launcher error and are currently used for search and rescue support rather than as normal operational members of the constellation.

A later European Commission update in December 2025 reported the successful launch of two new Galileo satellites, numbers 33 and 34, showing that the system is being expanded and reinforced for long-term continuity.

Services

Galileo offers several services, and official European GNSS sources emphasize that it is designed around a service architecture, not just a constellation.

Important services include:

• Open Service for mass-market users
• High Accuracy Service
• Search and Rescue support
• other guaranteed and specialized services for professional and institutional uses

The Galileo Services overview states that the Open Service is interoperable with GPS and improves positioning performance, especially in difficult environments such as cities. The High Accuracy Service page notes that Galileo provides free access to high-accuracy correction data through the Galileo signal and terrestrial means.

High Accuracy Service

One of Galileo’s most distinctive features is the High Accuracy Service, which European sources present as a major innovation. The High Accuracy Service entered initial service on 24 January 2023 and provides correction data that can be used to improve real-time positioning performance. The official service page also highlights that Galileo can broadcast this data directly through its signal in space, which is unusual among GNSS systems.

Strategic importance

Galileo matters because it gives Europe strategic autonomy in navigation and timing. European Commission sources emphasize that the programme is part of Europe’s autonomous space capability and is vital for long-term resilience in critical infrastructure. It also supports a very large device ecosystem, with the Commission stating in 2025 that Galileo provides navigation information to nearly four billion devices worldwide.

Distinctive features

Galileo stands out because:

• it is under civilian European control
• it is a global system
• it is interoperable with GPS and other GNSS
• it provides a free high accuracy service
• it is tied closely to Europe’s space and digital sovereignty strategy

Conclusion

Galileo is the European Union’s global navigation system and one of the most advanced GNSS constellations in the world. Its global coverage, civilian control, interoperability, and emphasis on high-accuracy service make it a major pillar of Europe’s technological and strategic autonomy.