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At present, the technology identified by coordinates positions on the Earth surface or GPS techno Yi have been used extensively. After allowing citizens can use it to activate the navigation system development. To facilitate travel to the destination by using in conjunction with a map that will serve the route to Earth. But the limitations of GPS systems: The satellite signals cannot reach inside the building. It caused an error or a lack of precision in identifying the position coordinates. It has been put into technologies helps to increase the accuracy of the navigation system, indoor track, and find out what's possible with.
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