So I am making the switch from my droid 1 to a new iPhone 4 on Verizon. The only thing that I use the most on my droid is the GPS. I work all over the state of Wyoming at time and really need this functionality. Which brings me to my question, what is the best app for GPS. I have to have maps that are saved on the phone as coverage in Wyoming can be spotty at times. Let me know your thoughts.