You can use a hotspot [from phone] out in the field in a pinch, but it will require you switching WiFi networks on the tablet between the hotspot - to load the map of the area you are at, and the Phantom's network - for camera and settings functionality. In the Go app, you can set to cache the maps, and that way you can pre-load the maps in the area you intend to fly while at home before leaving, then when you get to the place you are going to fly, they have been cached and are ready to be used without an internet connection. Basically the hotspot is good if you have poor planning skills.