In my training days in the Air Force (hmm, nearly 50 years ago) we had
to hike at night through the rain and fog in places like Snowdonia and
the Brecon Beacons. I was never athletic, even in my youth, so I
tended to hold everyone else up or get a blister on my foot (wimp I
hear you say). But I tell you, I was a damn good navigator and we
never had the slightest hiccup in virtually zero visibility in the
dark. So I was always in charge of the map. I must admit though,
today I would have a GPS - just as a back-up of course:-)

Jack