One of the compelling reasons to get a second generation iPhone was the new in-built GPS that would extend the "XPS" from Skyhook Wireless that was powering the positioning system of the first iPhone. While it might be quite fun and useful for rather static location based services, there is one problem:
Unfortunately, there's not much you can do with the G.P.S. According to Apple, the iPhone's G.P.S. antenna is much too small to emulate the turn-by-turn navigation of a G.P.S. unit for a vehicle, for example.
- For iPhone, the 'New' Is Relative
That in itself makes the GPS a fun addition but nothing new for areas that were already covered by the XPS data before.