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By default all garmin maps have the name gmapsupp.img, to prevent installed maps being overwritten by updates rename your additional maps to something like Europe.img etc etc.
They must though be placed directly in the Garmin directory either on the device internal memory or preferably on an add in micro sd card.
freezing77
@William.
So I've loaded up a few routes on the new Etrex 20, and after a bit of pestering from pop-up windows telling me map updates were available, I gave in and left the device plugged in to my laptop over night. Woke up to find the whole of europe had been deleted...
Currently trying to re-install Europe as none of my routes will work on 'worldwide autoroute' map which had supplanted evrything else...