You're never going to get anything accurate if you offer a curved path for a straight and level direction, as simple as that.
Yes, it will but the real issue here is not the so-called northern hemisphere but the so-called southern hemisphere and distances and it's this that I have the major issues with in terms of miles offered.
I don't think I failed. I think I did fine.
I've done enough for you and got back exactly what I guessed so forgive me if I don't offer you anything else on this because it doesn't gain you anything and it certainly doesn't solve anything, other than your belief that a flat map cannot be accurately made from a globe model, which we all knew anyway.
The distance of the curve would alter things.
But the same thing applies. A curved ocean. It's so ridiculous but there you go.
So the same thing would need to apply.
Your distances all offer a convex curvature, so we are arguing it from that point.