Help needed with editing VI campaign map

I'm working at moving the Scandanavian provinces to the provinces of Flanders and Holland in the VI campaign map. But what is needed? I've already changed the lukup images and I've changed, not too accurately though, the coordinates for the port, origin and castle.

All goes well until the campaign is completely loaded and then after the bar is red I get a CTD. Are the, probably incorrect, coordinates to blame, or did I forget something? If the coordinates are to blame, what is an accurate way to change them without using LMM?

Thanks for any responses,
Duke John