This is the Sony GPS module and Go!Explore software, it's fast, it's easy. I also have the cradle for in the car made to fit the slim and the 'fat' PSP.
Sony PSP Go!Explore
A Travel Story: Get Up Go Explore
Sony PSP GPS Go!Explore
Go!Explore trailer 2008
Go!Explore per Sony Psp: video review
Go Explore s Petrem Bakošem
GPS PSP Go!Explore