The other thing to consider @npnielsen is that relying on a cell phone can get you into all sorts of trouble with battery life. If you run a GPS app like Memory Map on your cell phone, the best policy is to switch the phone into airplane mode to preserve battery when you put the phone away. And then switch airplane mode off, and relocate yourself, when you want to check the map again. Alternatively, you can switch off Bluetooth, wifi and data only, but... When you are in areas of poor cell signal, the phone "hunts" for signal constantly, and this is the main cause for phones going flat much quicker than usual. Constant checking on the phone doesn't help either, nor does taking photos and videos and re-watching them...
Far better to carry a print out of your phone app map and refer to that are you go. Even in the Kaimais its quite easy to use a proper contour 1:25,000 or 1:50,000 map. Only check on your phone when you absolutely need to.
I do use my phone as my GPS, but I also carry a Anker power bank. The weight penalty is cancelled by not having to carry a phone, a GPS and a camera, and spare batteries. Plus the phone does so much more... ballistics, weather, barometer, altimeter, voice recorder (hunting notes), Google Earth when I've got 4G. And I carry an EPIRB, always.
Battery life is precious, look after it.
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