Drone Deliveries to Mobile GPS Location

Wild thought or not so wild thought? One day you may be able to have a delivery made to your GPS location ordering on your Mobile Device. The idea would be you place the order online using your Mobile Device (by then we will probably just call everything a "Device" and no longer use the term "PC" or "Tablet" or "Smart Phone). Once the order is placed you would decide if you want your order shipped to a location, or delivered to you via drone to your GPS location. Imagine ordering a tool on a construction site and within hours you'd receive the delivery by drone. While EngineerSupply doesn't deliver by drone (yet) but it is an interesting thought to say the least when you consider the logistics and possibilities of mobile commerce and distribution. Or, you're in the desert on a hiking trip and run out of water, so you order two bottled waters and a drone delivers them to your GPS location even if you've changed location and hiked further since you placed your order.