First of all, thanks for this tutorial, it really helps a lot!

Now I have a small question, is it possible to have no sea at all? I know about getting a landmass crash when you have a to large area of sea, but I was wondering if no sea at all will also gives you a CTD or problems with pathfinding of AI.

And if it's possible to have no sea, what files should I edit? I know that you would have to remove ports from map_regions and descr_strat and that you should remove admirals and ships from descr_strat. And also remove floot disasters and edit map_regions, map_heights and map_ground_types. But beside those do you also have to edit for example water_surface?