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The US spent 20 years and more than $20 billion on the GPS. Completed in 1994, the system has 24 navigation satellites and is widely used around the world.

　　Beidou has its own unique features, Ran said.

　　"It not only tells users where they are and what time it is but also allows users to tell others the information through short messages," Ran said, adding that this feature is being considered by other systems.

　　Russia's Glonass system achieved a 24-satellite constellation in 1996 but succumbed to funding problems.

　　The rebuilding of the Glonass system is almost finished and Russian media reported that the system resumed service earlier this month.

　　The European Union and the European Space Agency are building the Galileo satellite navigation system. Japan and India also intend to build independent regional navigation systems.

　　"Countries build their own systems because owning an independent satellite navigation system is important to economic development and national security," said Pang Zhihao, deputy editor-in-chief of the monthly publication Space International.