“If I am in the mountains where I have no cell service, will I have Navigation using my Android smart phone? If not I assume I would need to buy a system with Navigation, right?”
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If your phone has no service your navigation app won't work. However if you had the map saved before, the app uses cache data and still finishes the route. But you can't change or add to that route without data. The best option would be to get a GPS. If you want to use it in an area without cellular service.
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