[Will7272]

Connect your device using activesync.
Run Mapsource.
Click on Utilities---->Get Unit ID
Once you get your Unit ID, place it in the top line of the Keygen.
Get your GM XT Device Unlock Code and copy to cliwckedoard.
Go to Utilities and paste that 25 digit code into Mapsource.
On same keygen screen, look for Select Map Product.
Scroll down and select custom map set. A small window will open asking you to input the Map ID code.
Enter 243 in this field.
Get the map unlock code and enter that 25 digit code into Mapsource the same way you did your GM XT Device Unlock Code
This will unlock the detailed maps for the US and I believe Canada.