When flying many coastal areas I get this problem. A square or more tiles of coastal water appear unblended with the rest of the water. How can I stop this happening & what could be the cause?TIA.

There was another thread about this topic not too long ago. I think the general consensus was, that this is the way FS2004 is designed. It's the cut-off between two different MIP levels, I believe. Some people talked about various water textures that might lessen the effect.I think in your second pic, that the visibility is unrealistically high. So that would hide the change.Rhett

Looking at the second image, unless you've compressed the image it looks like you're running in 16-bit colour? Why not 32-bit? And turn extended textures on. Together, that might fix it.Allcott