Tondu, in general, I agree with your approach and premise. However, given that it has been pointed out that (a) the cities are not necessarily positioned exactly w/in the area they are located at the place they would be geographically (although probably they ARE within that area); and (b) the angle of the map and omission of certain terrain features (like some rivers) make a purely visual conclusion less than certain, I think we can cut some slack on slight latitudes in city positioning w/in areas as long as the city in question
should be within its area and its functionality corresponds to its historical/geographic counterpart.
Using that rubric, I'm not certain that saying Antwerp should be "north" (on the map) of Brussels means that it really isn't effectively where it should be...
Also, as much as this game is played, wouldn't some boardgame players have commented on this previously if a city were misplaced?
For the record, I am 110% in favor of accurate maps in ANY historical map wargame.