Interesting, I do a lot of backcountry with no cell and have mostly relied on old style maps turned to PDFs and downloaded or various OSM apps, this looks up my alley. One question though I often have for membership programs: how does it apply to families? I very much value all 4 of us in my household having the ability to share key apps and data, particularly for something that has safety applications. I see you have a Teams program but that looks commercially oriented. Apple has "Family Sharing" but for paid apps. How does that scenario work with Gaia Topo? If I grabbed a 5 year premium sub, would the kids be able to run off that too (at least while they're living at home) or does each individual need a separate membership?
Not trying to single you out or anything, I think a lot of the current app sales models and sub models are fairly individual focused at the present stage of things. More explicitly addressing couples/families (including what happens as they grow up/split) might be worth considering though, I think a lot of people will spend significantly more if it benefits links with household members.