Thinking of getting the new 3G IPhone with its enhanced GPS capabilities but don't think it would be smart to mount it. However, I could just put it in the tank bag or jacket pocket and listen to the directions with some ear buds. I need a new phone and this could save me a lot of money over getting something like a Zumo. Also it would be safer than looking at a GPS screen. Would this be a viable solution or is it important to see and hear our GPS?