For my Dakota 20 I have two 16 GB SDHC cards (Extrememory). One for the the maps/countries Northern part of Europe; the other the South part. I named the SD-cards (masstorage) North and South. On each SD-card I made a Garmin directory and for each country (map) a single countrydirectory and place the map of that country in that directory so they are unused. When I make a trip/vacation to a country, I link my Dakota with USB to my computer (Macintosh). The SD-card mounts on the desktop. I open it and I place the map of that country from it's own directory in the Garmin directory. All my gmapsupp.img's on these cards are renamed with the extension .img at the end.
On my trips I always have a small USB-cable with me. So I can manage my maps everywhere. Works excellent.
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