Not that it would help in this situation, but another option to provide GPS to a Wifi only iPad is a Garmin InReach. If you pair the iPad with the inReach it will provide GPS just like the Dual or GLO units. If you already have an inReach, this is a free solution. I use it with a Wifi iPad Pro, and it all connects automatically and works seamlessly. It is annoying that there is no functionality (that I know of) to allow your iPad to use the GPS from your iPhone when they are tethered.