Hello, I am very new to this. I would like to use the maps that I can download in my Garmin GPSMAP 421 on SD cards. I have tried using the tutorials, but most assume I know a lot more than I do to begin with. Could someone point me at a Tutorial that will start me from ground zero? I use torrents all the time, that part is not a problem, it's unlocking the maps, then getting them on an SD card that is baffling me. Thanks for your time.
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