How to: Installing Free Maps on your Garmin Fenix 5/6, Forerunner 945, or MARQ Series watch | DC Rainmaker
Osm auto translate with Garmin watch : r/openstreetmap
GitHub - roballey/OSM_Maps_For_Garmin: Maps for Garmin GPS units generated from OpenStreetMap data. Can build non-routeable images (suitable for Garmin Edge 520 etc) and routeable images (suitable for Garmin Edge 705, Fore Runner
Using OpenStreetMap on your GARMIN - Digital Geography