We’ve posted a couple of times about “virtual” GPS solutions for the iPhone that depend on cell tower identification, but now The partfoundry has announced the real deal. They will be offering a GPS dongle for the iPhone based on the SiRF Star III chipset. Needless to say this will require a jailbroken phone and the software “will be open source/community based.” They’ve already got a prototype working (video embedded after the jump) that can report its location and send it to the Google Maps application.