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Thanks to all for your response. I will try all those suggestions that you recommended and see if that does the trick. will let you know how it went

I just got a garmin gpsmap 62sc which didn't come with any preloaded maps. I downloaded the Arizona topo from this site along with the programs recommended on the tutorials  (garmin basecamp, mapinstall & mapmanager. However, I have been unable to upload this map from my Mac computer to my gps. The map seemed to have downloaded properly on my Mac computer but whenever I  try to open it, it says it is unable to "unarchive" it. I suspect this might be the reason why all those garmin programs are unable to find it and install it on my gps. Complete newbie to gps devices, so will appreciate any detail help anybody can give me.