just a quickie: the map included in the extras...
Just thought it was like Ultima maps, useful, nothing spoilifious about it, comes with the original physical game package... But then I took a quick look on the map that was in the Arcanum extras...
It's going to ruin the fun of exploring and I think it's a sort of cluebook material am I right?
I believe the extra's map from GOG does have all the locations shown on it. So yeah, it does have spoilers. I believe that the game originally came with a card that had a map (without towns/locations shown) on one side and the reference sheet (which is another of the extras on GOG) on the other side.
Here is a picture (from in game) that has a blank map that you can just look at if you'd like to just see the world. http://i.imgur.com/jwzAA.png