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I am brand new to the GPS community.......just purchased a Garmin Vista HCX.  I will use the unit to hike in SC and NC.  As I research, I realize that I need to purchase an SD card with Mapsource Topo for the Southeast.  It seems to me as if within this website is a download of Southeast Topo.  My questions are....is this the same download as if I were to buy it from Garmin?  Can I download that to my PC then just transfer it to a micro sd?  What is the process to do that and be able to use it on my Garmin?  I am somewhat computer literate, but certainly not an expert.