So if our cell phones can be tracked by the GPS in them and they don't cost gazillions of dollars then why not drones? Some of the quads available now have built in limitations allowing no more than 400ft in elv and 1000 ft in distance. I for one would not want to be flying in a small airplane or even an ultralight and be hit by a quad or conventional rc plane of any size. If a soft body bird can cause damage then what can 2-3 lb of model do to an aircraft traveling at 70-150 mph ? To say we should not worry at all is just plain ignorant. I just went before my local township board seeking permission to establish a flying field on public property and you can believe there is a real concern about drones and the issues they are creating. I am not against them but they need to be address by the ones who stand to lose the most when the law comes down.