FFrom mdion review:-
Having just bought the system all the eager owner needs to do is insert the battery and charge the unit. Helpfully Medion have supplied the navigation application installer pre-installed on the MMC cards. This negates the need to install the application and maps via a PC. The first of the two cards has SE England and Midlands maps as well as the application installer and the second has Scotland and Midlands to provide continuous coverage.
Sounds like you Install on to card via PC I assume with Medion in its USB cradle. click here