lol i did geology for my undergrad which required making geologic maps of areas by map and compass. My 2 cents is that knowing generally where you are when it's good visibility and there are clear dinstinct landmarks is easy peasy (eg there is a road that generally goes east west, and I know it's south of me, there is a single hill that is generally in that direction and a lake I can see in that direction means I'm probably in this area). Knowing exactly where you are when there is not good visibility is significantly more challenging because you need to keep accurate track of exactly what direction and how far you have gone (with some adjustment for elevation) because your current location is constantly being calculated relative to your previous location. The math is easy peasy, it's just a lot to mentally track for a sustained period of time especially if you've been out all day and conditions arent great. As soon as you lose track of your paces, you just gotta hope someone in the group remembers or hope that there is some reference point that you can see otherwise that map is gonna be looking pretty wonky lol.