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I downloaded the NE USA Topo Part 1, and it is working great but....I've been thinking that since I have a 2gb chip in my gps used solely for storage of waypoints and maps, that I have a lot of room left!  And am wondering, is there a way that I can add satalite imagry onto the topo file so it will appear as the topo maps layed over the imagry?  Thank you very much.  If it matters the gps unit is a Garmin Vista HCx.