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New to this...  Seems like simple enough instructions on downloading maps, but it doesn't seem to work for me.  Downloading 32 bit map to hard drive with basecamp closed.  Then open basecamp and click new maps and select find file.  Find the downloaded file, but mapinstall doesn't register any files in it.  What am I doing wrong?  I just got my gps and all updates and downloads are current.  Please advise.  Thanks!