If you get lost without a phone or a compass, and you literally can't find north, a few tricks may help you navigate back to civilization, one of which is to follow the land.
2
通过智能手机的GPS、指南针和气压计，该应用能远程确定某人的位置。
Taking advantage of a smart phone's GPS, compass and barometer, the app can determine the location of a person remotely.
3
现在，许多智能手机内置传感器，如加速计（探测设备是被横置还是竖置），回转仪和指南针。
Many now contain sensors such as accelerometers (which detect whether a gadget is being held vertically or horizontally), gyroscopes and compasses.
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