[asheshouse]

Thanks Auto. Your blurred version is an improvement. Map_F either way because the resolution of the land/water boundaries is not sharp enough. Not much can be done about that.
I think I might also darken the map_F by adding some darker green pixels to the land before blurring.
The sea in your screenshot looks very blue compared with what I see on screen.
I also notice the texture error around Calais-Marck airfield (Part 3 area), which will need correcting.