Hi, has anyone tried putting one of the sat nav apps from the iTunes store on their iPhone and using it during a journey? When I say "using it during a journey", I don't mean putting it on a mount on a bike. I mean just keeping it in a jacket/trouser pocket and taking it out now and again to check the route (while pulled over and stopped). I ask because I wonder if the iPhone is capable of holding the signal without being in a custom-made cradle which has a built-in GPS receiver. The apps I've been looking at are Co-pilot and Navigon. Thanks.
