the continuing convergence of all electronic devices into "phones"

For backpacking I still prefer a dedicated GPS unit because (a) it's waterproof plus I expect it to survive shock better than a smartphone; (b) it's power-thrifty and I can leave it on for the whole day without worrying about running down the battery; (c) it can run off AA batteries which are ubiquitous; (d) if you really need GPS, you need to carry two GPS-capable devices.