I think I have had a minor stroke.
As long as I could remember, up until 2010, I always knew where North was. In a locked room you could say "where is North" and I would point to it within 10 or 15 degrees. Then one day in a tent in Zambia I woke up having no idea at all where the sun would rise. It was terrifying.
I now carry a compass, but have noticed a lot of strange adaptations. Previously I could drive on the continent without bother. I now appear to automatically transpose left and right in my mind in order to do so. I noticed that on reading a sign in Groningen to use the East bypass, I turned toward the west. So both left turns and left-and-right on the map have been transposed. It's weird.
I can still navigate without GPS, but have come to use car sat-navs in unfamiliar places rather like old people have cookers with giant knobs - for comfort, not because it is essential.
Oh, and Mongolia is easy. Few roads, relatively flat landscape, good recognisable peaks on the skyline. And no woods. (the watch trick is a bit of a bugger when it is snowing heavily, mind) I recently got hopelessly lost in a 5 acre wood I have been walking my dogs through for 30 years. Had to go right out, work out where I was from the sunlight, and walk round the perimiter to somewhere obvious. (didn't need a GPS for that either)