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Definition: Galileo

A satellite-based radio navigation system initiated by the European Union and European Space Administration (ESA). Using 24 satellites and six spares, Galileo was designed to interoperate with the U.S. GPS and Russian GLONASS systems. Completion is expected in 2020 with positioning accuracy of one meter (GPS is 20m; GLONASS is 60m). The first Galileo test satellite (GIOVE-A) was launched in late 2005, and the initial system went live in 2016. For more information, visit http://esa.int/Applications/Navigation/Galileo. See GNSS and GPS.