Uploading open street map (OSM) to garmin 830

I'm trying to upload an Open Street Map (OSM) for Nowary and Denmark to my Garmin 830.  The only  instructions I can find are for putting the maps on an SD card.  But...the 820 doesn't have an SD Card.  Do I put it into a folder on the 830?  If so, which one?  There is a "custom maps" folder.  Do I drop the .img file into that folder?

Thanks

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