I have walked all the way down to a coordinate of 0.0.
At that point, it wrapped to 2047.99 (2048.0?)
The zone switched from 210 to 190.

My question is: what does this mean?
Is there a 20x20 grid of 400 cells, each with coords from 0-2048 in horizontal and vertical direction?
This would mean that the map is *HUGE*, it would take hours to go from one end to the other...

EDIT: the figure of 20x20 comes from the fact that walking in a straight line south, the zone switched down by 20. This means that a "row" of the grid has 20 cells in it.