gmapsupp.img is an already pre-compiled map for for GPS device, you can't simply open it in MapSource. You need to just copy the file into your GPS's memory card, put it into folder named Garmin, like X:\Garmin if your memory card shows up as drive X: on your PC (you connect your GPS via USB cable and then from GPS menu choose to connect as mass storage device). You must keep name gmapsupp.img, otherwise GPS will not reckognize it. If that file already exists on your memory card then you have already loaded some maps to the card. If you overwrite your existing file then existing maps will be deleted. If you have no MapSource installation for this map then you can't easily load multiple maps into your GPS, but only can have this one map and as soon as you send more maps from MapSource, this map will be overwitten with new maps. You can put it on a separate memory card, though, and then switch the cards.
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