Differential theory plays an important role in GPS navigation and positioning.

差分理论是GPS导航与定位中的一个重要理论。

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GPS navigation and positioning services provide good prospects for development.

提供GPS导航和定位服务有着良好的发展前景。

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GPS navigation and positioning in buses, traffic system, as it were, the application prospect is very broad.

可以说，GPS导航定位在公交、交通系统中的应用前景是非常广阔的。

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Maps and GPS (global positioning system) navigation in cars are very popular, and all of those maps came from one of just two mapmaking companies.

NPR: Map-Making Firms Rumored to Sell for Billions