From time to time I need to track “lost” devices used by employees. But I’m always disappointed that, AFAIK, no single app has all the features basic features:
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Remotely activate GPS on the “lost” device. Androidlost and Airdroid does this well.
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Frequent updates with heading and speed. (Low bandwidth protocol like UDP ??) And while the GPS is waiting for a lock, display the satellite reception strengths.
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Support both phones and tablets.
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Easy to use authentication, like Airdroid.
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Easily allow groups to track each other. Just like adding people to a hangout.
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Chase the “lost” device with another android. On reflection, the simpler the better. Distance and bearing is enough: http://xkcd.com/407/