That is SUCH a good point. Now that you say something, that is a bit nebulous! I think the maps have enough points of interest for players to try and "call their shot" onto the map. They basically pick a point on the map, look at the DC in that "band", and can make their stat checks to travel and take all the good/bad consequences of the travel.
Really good point that I don't ever explicitly say "the party's archer should pick a square or intended target in the next region and then everyone uses the associated DC for their Role's stat check"
I'm sure that was in some draft language that got cut down to simplify into the page limit......
Thank you for taking the time to review and comment!