User orientation sensor: directional heading from a digitalcompass.
方向感知：基于数码罗盘的方向指南。
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It USES the GPS and digitalcompass built into many phones and tablets to mark these sites directly on a live feed displayed on the device's screen-a technique known as augmented reality.
Likely features include a digitalcompass, processor and memory upgrades, an improved digital camera with auto-focus and video-recording capabilities, and other minor improvements.