Can someone explain to me the procedure for updating maps for the Garmin nuvi? I know there's a way to do it by connecting the Garmin to a PC using a USB cable, and updating the map stored in the Garmin itself. However, I'd like to have several different maps (say one for the US and one for Europe), so I wonder if I can store each map on an SD card, then just pop in the card when I want to use a map. Will Garmin recognize the new map and start routing with it? Also, how big an SD card do I need, 2, 4 or 8 gigs?
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