Yeah, the iPhone fails for foot navigation. Whether I'm in the canyon's of NYC or the dwarf pine forests of the NJ Pinelands, it seems the compass never wants to point in the right direction -- even after waving it in a figure 8 for calibration.

The other problem with an iPhone is short battery life. Out in the field using a map/gps app, my battery will be dead in 4 hours.

I'm glad it worked out for this guy, but personally I'd plan on bringing more reliable gear next time around.