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When is GPS data provided to the Location API?
As in Windows 7, the Location API is built on the Sensors API, and the information in location reports comes from location sensors. The Location API determines the most accurate location sensor for a given report type. This simplifies programming because the Location API will only provide one report of a particular type, even when there are multiple location sensors available. When the Windows Location Provider and GPS both exist on the system and are providing data, the Location API will use the sensor with the most accurate data. In most cases when both WiFi and GPS are available, the GPS will be more accurate and its data will be passed to the application.