Are you using any particular gps software on the mini to navigate ? Does the mini iPad work without cell service remotely ?
I use GAIA GPS. I have used it for many years backpacking (I was a Scoutmaster for years) and in the jeep. Until now it was just on my iphone and it works well. Just be sure to download the map layers you want of the area you will be in so they work off-line. I use the previous generation iPad mini with LTE. I don't have a cell subscription. But the LTE version has the GPS chipset so GAIA GPS can use your location on the map. If I need it to be online and am in an area with reception, I just setup my phone as a hotspot and connect to it from the iPad.
I also use OneDrive to sync a part number spreadsheet, some diagrams and other info I want to have available on the trail. When driving, I use Google or Apple maps on the iPad and also have sync'd my podcasts and large Spotify music playlists. So those are all streaming when driving when I want and they are easier to control than the smaller phone. I also have the apps for my Dometic refrigerator and Bluetti power station.
I may also add a wireless backup camera, with hard wired 12V, that goes to an iPad app to turn on when backing up on a trail. It's hard to get a good view with 35" tire back there.
OnX maps has come along way in the past couple of years. It has tons of trails with descriptions and ratings. I think it might be better for most people. I may do a trial version to check it out.
I also sync maps to my Garmin GPSMAP 67i in case the phone and/or iPad don't work. They don't like to charge well when really cold or hot and are much more delicate. The ipad and iPhone will dim the screen when they get really hot. The Garmin is much more rugged and uses buttons instead of a touch screen. 90% of the time I am using the iPad or iPhone but the Garmin is a great fail safe. It is also my InReach satellite messenger so I can stay in touch woth my wife or others. And of course call for a rescue if needed.