I hear you on the heavy fog.
There have been times I have had to pull over and make sure that I was still on the road.
One hunting season (again) I pulled my truck up into this old logging road and parked it there. It was early in the morning and It was foggy. When we came back to our vehicles at about noon, I found that my truck had been parked about 40 feet into the woods.
"Who moved my truck?" I wondered.
Then I realized what I had done.
I hadn't thought of that one. Thanks for bringing it up.

BTW - I went hunting again yesterday. This time I took the map and compass with me. Not going to make that mistake again. If they ever find me frozen to a tree stump somewhere, they will know that it is because of a different mistake.