Sorry for the noob question. I've been searching for a few hours, reading, trying to gather how i can make this all work. I had a garmin Nuvi that was stolen from my car a few months back . Since then, I've been thinking maybe i need to just replace it, but I wanted to get something that will translate over to my bike as well. I'm frugal, so I'm trying to trace down a cheap solution that uses something I already own, an Iphone4. What I'd like: Turn-by-turn GPS Custom maps that can be uploaded for trails CHEAP No/limited data reliability (when out of cell service) - this is a big one, otherwise the Phone idea is pitched Needs to be waterproof/rugged. Mounting to handblebars, car...etc Charging cord can be attached when in mount - understandably will lose waterproofing function, but i can yank the cord and seal it when it starts raining in those events. So, I've seen that the Motionx Drive, and MotionX GPS SHOULD do what i want, correct? I can preload maps based on where i know I'll be traveling, and it should not need the data service. (correct me if I'm wrong). It's also cheap As far as mounting/waterproof, I've looked at the Lifeproof solution, but it seems like when mounted you can't charge it? Does anyone have experience? Are there any other solutions out there?