Unrar and copy the directory City Navigator Brazil NT 2010.30.gmap in C:\Documents and Settings\All Users\Application data\GARMIN\Maps
The map will be ready for Mapsource.
Copy "City Navigator Brazil NT 2010.30.gmap" to "C:\ProgramData\GARMIN\Maps" if you're using Windows Vista or Windows 7.
Window XP users copy to "C:\Documents and Settings\All Users\Application data\GARMIN\Maps" as mentioned in post #1.
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