Seems that even Garmin discovered garmin.openstreetmap.nl
Cool!
I’m surprised they are using those maps on a Garmin Fenix. It has very limited memory (20MB), so you wouldn’t fit much on, and it would be rather slow.
Something like these OSM based maps would probably be better - they are designed for the Fenix, so much simpler: http://www.gmaptool.eu/en/content/maps-garmin-fenix
It’s Garmin, thats they way they do it. They never do it right…