European transport ministers have approved a plan to develop Galileo, a satellite navigation system. Galileo, which is due to come online in 2008, is expected to cost $3.15 billion US and will consist of 30 satellites deployed in three circular Medium Earth Orbits at an altitude of 23,616 km. Although the system will compete with the US-built Global Positioning System, the designers say the two networks will be compatible and provide redundancy.
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