Honestly haven't watched that close but I don't imagine they show too much detail since they mainly use it to draw on. They probably show most rail connections and as many cities/towns as makes sense as dots without details.
Administrative regions would probably make sense if you're using that question to make it easier to fill in.
Imo you want to use this map to get a quick overview of the possible hiding zones at a glance so the more detail the map itself has the harder your drawn lines will be to spot.
The material I'm pretty sure is just regular map paper.