Plots so far:

Azelor on the north island.

Falconius on the island in the direct center.

BlackChakram near the inland water on the continent to the east.

Plots1.jpg

A problem with keeping them square is also the implication that one has to map everything in that square, but of one only wants to map a specific country it is very unlikely its boarders would match, meaning he'll end up mapping a corner of something he doesn't know/care about necessarily.