Openstreetmap sourced. Their android app windy maps is pretty good for hiking trails.
I didn't know that! Windys color scheme is a lot clearer (and I like you see hiking trail numbers on it) but OSM shows hiking refuges when more zoomed out.
EDIT: https://i.imgur.com/WBiptdo.png for example on OSM, vs https://i.imgur.com/EsZCsA8.png on Windy
Lots of conversation & discussion about self-hosting / cloud exits these days (pros, cons, etc.) Happy to engage :-)
Cheers!
Interesting project. Do you have any screenshots of the UI of Disco?