But to the more important stuff: the main tools I've been using for trail/route planning (for over 6K miles) are Gaia and CalTopo. These tools have a lot of route building tools and overlays for both planning and navigation and I guess you don't want to replace these tools and if you acknowledge hikers are using these tools already and see a way to complement them somehow, I think you want to let the user directly reference their tracks/routes from within Ambulate as it's unlikely they'd like to replicate their work in another tool.