The Galileo positioning system is a proposed satellite navigation system, to be built by the European Union (EU) as an alternative to the US military-controlled Global Positioning System and the Russian GLONASS. The system should be operational by 2010, two years later than originally anticipated. The Galileo positioning system is not abbreviated to GPS; use of the acronym "GPS", here and elsewhere, refers to the existing United States system. The Galileo System will comprise global, regional and local components. The global component is the core of the system, comprising the satellites and the required ground segment The regional component of Galileo may comprise a number of External Region Integrity Systems (ERIS), implemented and operated by organisations, countri View the rest of this article
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