Looking real nice there, Diamond! Got to love the rhumb circles as other have pointed out too!

Liking the nice space you're giving the map around the border and the backgorund and grassland texturing are just perfect!

Only slight nitpick I have is the mountain texture. Something about it just doesn't quite gel with me. I think it's because when close up, it just seems slightly less defined than the other parts of the map. Who knows though, might just be me.

Otherwise, looking very nice indeed Diamond!