I am considering an iPad Mini 4 for my Phantom 4 Pro. I want to get the Wifi only version to save money. Not having cellular connection, what concerns might there be regarding the drone's capabilities? Will not having cellular data while flying affect GPS, intelligent flight modes, or anything else in any way? If I do wind up having to get the cellular version, does that also mean having to get a data plan with my carrier? I did read in the iPad's specs that only the cellular version has bulit in GPS. Any clarification is greatly appreciated. Thanks!