At the moment I'm planning on purchasing the Google Nexus 9 for my P3S. Since it(tablet) will have WiFi connectivity only, but my drone has a GPS receiver, do I have to download maps from Google Maps or is their another APP to use? Or is there some other process I must do? Do I just use Google Maps when I go to wherever I'm going to fly and download at that time? Any direction you guys/gals can give me would be much appreciated. How many gigs of storage would I need to be able to do what I need to do (16, 32, 64, or 128). Tablet will only have the DJI and Map apps. because it will just be for drone(s) flying, pics, and videos. Thanx in advance. H.P.