Used in combination with GPS, an accelerometer, a compass and the gyroscope can be used for in indoor navigation with floor accuracy.

与全球定位系统、加速度计、陀螺仪和指南针结合使用，可用于具有地面精度的室内导航。

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What we need is an indoor equivalent of GPS.

我们需要一款室内GPS装置。

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2011 will see more sensors incorporated into nomadic devices to take location to areas where A-GPS has challenges, such as indoor or underground navigation.

2011年我们将会看到更多的传感器集合成可移动的设备，这些设备将会把定位技术带到A - GPS已经占据的领域，比如说室内和地下导航。

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The data from this indoor GPS system is sent to computers where custom-built software sends commands to the quadrocopters via wifi.

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Apple has bought a company called WiFiSLAM, a 2-year-old Silicon Valley-based startup focused on indoor GPS, the company has confirmed to the Wall Street Journal and other outlets.

CNN: The growing push to track your location indoors

With indoor location, users can get turn-by-turn directions inside buildings, just as they would outdoor with GPS. While retailers can target consumers as they get closer to their shops, sending promotions and coupons directly to their smartphone.

FORBES: Pole Star Unveils Indoor Location Cloud For iPhone, Android (video)