This is all great news. Quadcopters (I hate the term drone) and iPhones using this technology will make finding people trapped in earthquakes, lost in woods etc. not to mention hostages and kidnap victims, a lot easier for the fire and rescue services and police. I know they already have far better technology but expensive and often requiring manned helicopters. The cost of a fleet of small quadcopter with these would be relatively low and deployment very fast.