Anyone with depth perception can read them. They aren't that hard to figure out. It clearly shows you the roads on the outside of the dungeon and when you're inside, it shows you how the corridors connect. It doesn't take much thought to read them.
I mean, there’s a giant glowing dot on the map for a reason...
There’s also the giant wiggling cocoon in the roof of the sanctum even if you weren’t looking at the map, which you can easily see before walking in there.