Using GMapTool to convert OSM Topo maps for Garmin
https://www.johndball.com/using-gmaptool-to-convert-osm-topo-maps-for-garmin/
WebJul 8, 2017 · Simply download the correct file size (500 mb, 1 gb, 2 gb, 4 gb) file based on your LAT and LONG, rename to “gmapsupp.img”, put this in the “GARMIN” folder on your MicroSD card, and load into your GPS. The URL for downloading the pre-compiled IMG files can be found here: https://daveh.dev.openstreetmap.org/garmin/Lambertus/latest/
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