[lowfighter]

It's not map_F, that's regulating what you see in far distance in excelent. If you look at the 2 pics you see there's the same tiling problem with perfect settings, only it's less visible. I think it is connected with the fact that you have 2 types of water (2 colors) painted on map_T, one type for the bulk, the other at the shores. On excelent the blend of the 2 is not good. I remember seeing it on some default maps on excelent settings, long time ago, before switching to perfect. If you look at some default pacific maps which have this type of water you'll see the same effect.


EDIT: there might be the other possibility with map_c namely at the border between water and land, the grey shades between pure white and pure black. Needs testing both. What happens if you remove the intermediary colors at the water-land border?