File Description Deniska's just released te first Map This! beta homebrew that supports the original Sony GPS accessory (PSP-290). Check out the changelog for Map This! v0.461S below:
* GPS info screen with satellite data * Screen rotation in map mode * Trip reset option added to menu. Trip data does not get reset when you switch to map mode. * Fixed a bug in TRACK UP mode. (should not switch the mode when approaching to map's boundaries.
The GPS-homebrew master notes that some features, like teh GPS data re-play and WiFi download aren't supported in this version release. Hopefully he can put it in the future.
If you don't know how to map this out on your PSP, check out the readme file include. Installation instructions and other notes are inculded there.