I use the phone. Let's start there, because this is not an argument that technology has ruined navigation.

The phone is better than paper at three things, and they matter. It knows where you are, instantly and without doubt, which in poor visibility is worth a great deal. It weighs nothing extra because you were carrying it anyway. And it does not turn into papier-mâché in rain.

Here is what it does not do.

It does not show you the whole day at once. A 1:25,000 sheet opened on a rock shows you where you've been, where you are, where you're going, and — crucially — the three places you could bail out to if the weather turns, all in one glance. A phone shows you a window roughly the size of a playing card. You can zoom out, but then you lose the detail, and you cannot have both at the same time. On paper you always have both.

It does not survive being dropped on limestone, and it does not last a winter day at four degrees with the screen on.

And it does not make you look. This is the real one. Following a blue dot along a line is not navigating, it's being escorted. You arrive at the end of the day having seen the ground but not read it. Do it with a map and a compass and you are constantly checking the land against the paper — that re-entrant, that wall junction, that change of slope — and you finish the day actually knowing where you went.

So: both. The map lives in the lid of the pack and comes out at every decision. The phone lives in a pocket and settles arguments.

The day the phone dies, nothing changes. That is the entire point of carrying the map, and it is worth the 200 grams even on the days you never unfold it.