Planning to buy an iPad Mini 4 for my MPP. After reading numerous threads on this forum I am more confused. I know the cellular version has GPS. Is this only for "Follow Me and Active Track" modes? I would like to use these modes. I do not want to add another monthly cost, ($10) to my cell bill or pay the higher cost of the cellular version upfront. Will the WiFi only version, while flying linked to my phones hotspot, do everything the cellular version will do, to include the "Follow Me and Active Track" modes? Is there any other difference I am not a where of?