I recently bought a Phantom 3 Advanced. I am a photographer and I find flying it and taking photos with it to be a joy. I have been using an iPhone 5s with DJI pilot. In order to have a bigger screen I am looking at getting an iPad Air 2. It has a faster CPU and more RAM (2gb vs 1 gb) than the other iPads. (Android fans, I know most Android tablets have GPS. I'm used to Apple products and I can afford the higher price) I am debating whether to get the cellular model. I understand that the wifi model doesn't have GPS. So with the wifi model, is true that maps won't show up? If I use my iPhone as a wifi hot spot, could I get maps on the iPad Air 2 wifi unit? Also, I am wondering if I should get the 16gb or the 64gb model. I don't plan to keep too many apps or photos or music on this iPad, but it seems like you always find a use for more storage. It gets down to money, cellular with 64gb is $729 new and 16gb wifi is $499. There is always the Apple refurb store with prices at $609 and $419. I am looking to get input from real world users who are using DJI Pilot with a Phantom 3 and an iPad Air 2. Does not having GPS pose an issue, if wifi connected to a phone? Would you recommend 64gb over 16gb?