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:

• Remotely activate GPS on the “lost” device. Androidlost and Airdroid does this well.

• 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.

• Support both phones and tablets.

• Easy to use authentication, like Airdroid.

• Easily allow groups to track each other. Just like adding people to a hangout.

• Chase the “lost” device with another android. On reflection, the simpler the better. Distance and bearing is enough: http://xkcd.com/407/