We've had so many homebrew applications in the past that provide us with map programs for the Sony PlayStation Portable. If those didn't the trick for you, then may this next one from coder Royale will do.

The coder, known for his Chromium PSP port has ported Google Maps to the Sony handheld. However, note that he interface was made simpler and that the program doesn't utilize the Google Maps API.

Instead, PSP-Maps retrieves the images directly. The program is currently on version 0.1 and as such, there are some bugs found in the code like it is only capable of using the first WiFi connection.

PSP-Maps v0.1 comes with its own Readme.txt file which should provide you with further help. Also, you may want to refer to the source link below for more details.