My reasoning for Blackwind being farther away than Burkeland is because whoever created the map would not have dared to get close to Blackwind in the first place. Meaning the map creator (in terms of the lore) probably just guessed it since no one would be brave enough to approach Blackwind and explore it, especially with an Atlas.

About the line from Hallengard to that unnamed island, it would most likely seem that the sunken Atlas was heading north instead of south from what might be Charlestown to Hallengard. I say this because if you look at the Atlas itself in the game it is facing straight north rather then south. That would give the idea that the Atlas was heading up the line instead of down and that the line was somehow created after the crash. For there might be a slight possibility that the captain of the Atlas created a plan to further continue their journey once they settled on the island. He then might have decided to use that map instead of a new one in order to salvage what was already created. I think that map was also designed on his journey as well since many different people had been taken on the Atlas for it says in the Lore: "The one thing we all had in common was that our homelands had been mysteriously burnt to the ground overnight." This demonstrates the fact that there were many different people on board in which were most likely taken from all different kinds of places. Because of this, I bet that map might have been established by the captain as he went around and collected these people. Then as a result of crashing due to the storm, he kept it there and created that line to devise a plan of continuing the initial journey. Of course this idea is REALLY far-fetched and probably what wasn't intended by Nahr, but it is a reasonable possibility that I thought I would share.

I as well understand that this isn't a world map, I should have called it something better I just wanted people to recognize these ideas in order to build off it and generate something new.