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Please note that the map file must be called gmapsupp.img this is how it will extract from the zip file from here.
http://garmin.openstreetmap.nl/
Unlike the edge series and the later etrex series only one map can be active on the etrex hcx series.
Riggt, drunk.
Can someone please reitterate how to get OSM maps on a Garmin? I've done it before but perhaps not as slammed. I need maps of the Azores on an etrex vista hcx. Err.. how?