One question I would like to ask, what happens if you sail NE, SE, SW or NW and hit the diagonal zone line as from what I can see the tiles support N, E, S and W tiles to pre load. Im guessing it would be easier to adjust the direction your sailing so you don't hit the corner of a tile.
My apologies if this is a daft question but unless the other side by side tiles, shown in your video, can be loaded to cover the diagonal tiles I don't see any other way to do it, maybe I missed some explanation in your video and apologise if I have.
Amazing work you are doing and would love to try it out on a home server if you permit.
Many thanks and keep up the amazing work you are trailblazing.