Is Galileo compatible with GPS?

Galileo is fully interoperable with GPS, and with other GNSS programmes. The combined use of Galileo and other GNSS brings many benefits to the end user. 

Galileo supports an enhanced level of interoperability with GPS thanks to the broadcast of a specific parameter (the Galileo to GPS Time Offset) that simplify the combined exploitation by Galileo receivers of the two constellations. The concurrent use of various GNSS offers more accurate and reliable positioning and timing synchronisation for end users. Navigation in cities or in complex environments, where satellite signals can often be blocked by buildings, tunnels or cut-offs, particularly benefit from the higher number of satellites in view.

Galileo's accurate timing capability also helps enable more robust, reliable, efficient and resilient synchronisation for critical use domains as banking and financial transactions, telecommunication and energy distribution networks.