Install Free Maps on Garmin BaseCamp (Openstreetmap) - No Place Like Outside
OSM maps for Garmin
OpenStreetMap Quality Assurance with a Garmin GPS — Derick Rethans
USERBEAM - OpenStreetMap for Garmin GPS devices
GitHub - roballey/OSM_Maps_For_Garmin: Maps for Garmin GPS units generated from OpenStreetMap data. Includes all the configuration files used to generate the Garmin maps. Can build non-routeable images (suitable for Garmin Edge 520
User:Petrovsk/My Garmin map styles - OpenStreetMap Wiki