I think that, somewhere along the line, Apple decided to make the GPS antenna available to only those units that were able to use "cellular data". Without "Cellular data" you will not be able to get a map on the screen unless you load it PRIOR to getting out of WiFi range. I had an ipad second generation and used it on boat deliveries for navigation backup. It would work 60 nautical miles off shore well out of reach of cell coverage. I now have an ipad pro and decided I only needed the WiFi version. It will not bring up the map unless I tether it to my iphone. I'm no tech wizard (79) so if anyone has some input about this please feel free to educate me.

I believe you are correct. My Ipad pro 12.7" has cellular but I never use it.This page has a chart that list devices compatable with DJI products.
https://www.phantomhelp.com/Tips ... go-updated-daily.18
See the notes under the apple chart.
Only the cellular Ipad has GPS.