A paper map does not need a signal or a battery, which is exactly why it belongs in every pack alongside a phone.
Contour lines tell the story
Tightly packed lines mean steep ground; wide gaps mean gentle terrain. Learn to see the shape of a valley before you ever set foot in it.
Orient before you move
Line up the map with the terrain in front of you using a compass or two known landmarks, then keep checking as you go rather than after you are already lost.

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