This spring will see the release of the GPS unit for the PSP according to PSP Fanboy.
GPS receiver and UMD (including maps of the relevant country): RRP €119 (approx £89)
GPS receiver, UMD (including maps), Car Adaptor and Car Mount: RRP €149 (approx £111)
PSP, GPS receiver, UMD (including maps), Car Adaptor and Car Mount: RRP €299 (approx £223)
Interestingly you will be able to see landmarks in 3D.
When you travel on foot, you’ll be able to see cities in full 3D. You can select a destination, and watch landmarks and other POIs appear on the screen.