alt Hacker NewsOSMAnd is similarly OSM-based, offline, and FOSS (available from F-Droid) and does tracking. It is not typically recommended in posts like these because its wealth of options is daunting to the general public, while Organic Maps and CoMaps are more streamlined.
I have been a happy user of OsmAnd+ for over 15 years at this point, I can strongly recommend it if you need power user features.
(Yes the OsmAnd+ is the paid version, but it is the old pay-once version and I have definitely got my money's worth at this point, and it supports an open source project.)