I've written before about navigating with the iPhone, and the differences between having the maps on board your phone versus downloading them over the air.
The differences were readily obvious on my recent photo trek to the Monument Valley area on the Arizona and Utah border. 30 miles south of Kayenta, I fired up the Garmin GPS app. It needs an internet connection to work, and none were available. In that part of the country, AT&T has nothing, so when I had any signal at all, I was roaming. You can see the resu
