PSP GPS substitute?

Deniska, do you believe is posible to use any GPS instead the Sony's? I mean, I think is posible to take a simple rs232 gps and add some hardware interfase to convert to usb (a microcontroller), and in that interface add the commands needed to be recognized as a Sony gps. What do you think? :confused: . This can be an option to all the psp's owners that want a gps but in their countries is too hard to get it; but it will work with te games that support the use of gps. any suggestion?...