Love the quote from the GPS president:
iPhone Nano, GPS Are More Important to Apple Than 3G: Analysis
I recently sat down with the president of a GPS navigation system manufacturer to ask him how he felt about the prospect of a GPS-enabled iPhone. "Scared [expletive]-less," he said.
Yet the iPhone has the potential to leverage true GPS functionality better than any other device. It already has a large, 3.5-in touchscreen interface, external speakers and an elegant Google Maps interface. All you'd need to add to a GPS-enabled iPhone is a suction-cup windshield bracket (sold separately, of course), and you'd have a fully-functional, pocket-portable car navigation device. People already pay hundreds of dollars in droves for this increasingly popular segment of devices, and the iPhone could essentially challenge an entire product category with one add-on feature.