I am not sure about outside of the UK, but for domestic navigating:
http://www.scarletfire.co.uk/a-quick-guide-to-free-osm-maps-for-garmin-gps-devices/
I have done this on my 800 and it worked a treat. Had to buy a 2GB MicroSD card for about £4, but that's a lot cheaper than basemaps. However I'd be interested to know if the Garmin certified are much better..
@onyerbike started
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I am not sure about outside of the UK, but for domestic navigating:
http://www.scarletfire.co.uk/a-quick-guide-to-free-osm-maps-for-garmin-gps-devices/
I have done this on my 800 and it worked a treat. Had to buy a 2GB MicroSD card for about £4, but that's a lot cheaper than basemaps. However I'd be interested to know if the Garmin certified are much better..