This rescue drone finds lost people by picking up their phone signal

In an emergency, a mobile phone can be the device that saves you, even if you aren’t able to make a call. A drone developed at the Swiss Federal Institute of Technology in Lausanne can pinpoint the location of a mobile phone by picking up its Wi-Fi signal. The drone, which was first reported by Robohub, can pick out the location of an individual phone within 30 feet.