I just got back from a week in the hills around Death Valley. I use the iPad Mini 4 (non-cellular version with 128 GB of memory) and the InReach Mini. I use both Earthmate and Gaia GPS. It worked beautifully and with my pre-planned route. The iPad was $299 and with REI discounts my InReach was $200. I have over 70 GB free and I’ve loaded google maps, Gaia maps, and a ton of apps for KOA’s, national park apps, and so on. It my dedicated travel device. It even worked in the depths of Goler Wash. I use the Scosche mounts from Best Buy (cheap) and can be moved around as needed. While I still need my glasses to read anything, it worked out very well.