I've travelled all over the world using only my phone with offline maps as gps. The only problems I had was my iPhone constantly overheating because of the waterproof case I had it in. I suspect that the iPhone 7 (being already waterproof) would be perfect for you.
I use a Samsung Note4 with Backcountry Navigator. With a 5.7" screen, it is so much easier to read than most of the dedicated gps units.
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