I'm a total newbie at this Map down and uploading. But I just discovered something that may save others a ton of time. I somehow lost all the maps I installed to my Garmin 60 csx. Probably due to canceling a upload to the unit and unplugging too soon. Needless to say I was bummed since each state topo took an hour or more. I am now reloading everything onto the card using a high speed card reader and it seems to be way faster than transferring directly to the gps unit.. I mean just a few minutes instead of more than an hour.. Probably a no brainer for you veterans but thought I'd mention it for others.... [Mac OS X, Garmin Map install, Garmin map manager ]