If you are using the newer BLAUPUNKT HU with GARMIN GPS, you can download the latest free GARMIN map data from the MalfreeMaps forum (http://www.malfreemaps.com/index.php?sid=d19b58513b62b950e53f82fd381c2cf4). You'll need to sign up as a member to be able to download the map data. Do appreciate their work by giving a word of thanks thereafter.
a. Execute the downloaded file on your PC by referring to the installation instructions on their forum website.
b. After the successful execution, the file "gmapsupp.img" will be created in the "c:\Garmin\Malfreemaps" folder (default setting).
c. Copy this file "gmapsupp.img" into your MicroSD card in the "Garmin" folder.
d. Rename the 2 existing files "gmapprom.img" and gmapprom1.img" on the MicroSD card to "gmapprom.old" and "gmapprom1.old" respectively.
e. Rename the copied file "gmapsupp.img" to "gmapprom.img".
Insert the MicroSD card into the BLAUPUNKT HU and run the GARMIN GPS. It should be using the updated map data from Malfreemaps. You can also reconfirm the map data version from the "Map Set" option in the GARMIN GPS software.
The above had worked for me. Caveat Emptor. Try at your own risk, albeit minimal because should it doesn't work, then just delete the renamed "gmapprom.img" file and revert the original 2 files with the ".old" extension back to their original ".img" extension.