Yes, definitely the large majority of AT hikers I've met rely very heavily on the GutHook/FarOut app as their primary nav tool. It has pretty great offline feat

Yes, definitely the large majority of AT hikers I've met rely very heavily on the GutHook/FarOut app as their primary nav tool. It has pretty great offline features in my experience, and has a huge variety of trail maps for purchase, with all the critical waypoints and resources listed. I've used it for customizing hikes, but I think much less customizable than OP, it's a bit more of a plug-and-play experience.