Use MapSource & GMAP anywhere
You can use Mapsource and gmap folders easy from anywhere
1. just copy mapsource.exe (and maybe your language file) to eg. your USB drive :\Mapsource
2. make directory :\Mapsource\Maps
3. copy all GMAP folder to this Maps directory and run :\Mapsource\mapsource.exe
( You can use any directory just make Maps folder to same directory with mapsource.exe )
this way you not need copy all your maps to %APPDATA%
That trick ...