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You could try OpenTracks, I used it a few years ago and it was pretty good.
Does OpenTracks have the features you’re wanting? It tracks your path, shows stats, and allows you to save it to recall later. It’s on F-Droid. https://opentracksapp.com
Check out Fito Track as well which is pretty similar (and on F-Droid as well).
Fitotrack is exceptional. Can export data, then process it anywhere.
I used to use Out-Run. v1.2 in the change log notes that the app is open source.
It looks like it hasn’t been updated in some time though.
https://apps.apple.com/ca/app/out-run/id1477511092
It was harder than it should have been to find the GitHub page but here it is. I linked to the issues list. Seems like it’s got a quite a few. Maybe somebody will pick the project up.
Phonetrack with app for Nextcloud is quite nice.
https://f-droid.org/packages/net.eneiluj.nextcloud.phonetrack/
