Garmin is really good when it comes to open maps. I can still put new OpenStreetMap maps on an old Garmin 62s like it's 2010. I recently replaced my Apple Watch

Garmin is really good when it comes to open maps. I can still put new OpenStreetMap maps on an old Garmin 62s like it's 2010. I recently replaced my Apple Watch by a Garmin Fenix 7 Pro and even though it's not really advertised, it just accepts good old map .img files. I put on the Dutch cycle network overlay without any issues, just like I did with my Garmin GPSr units.