Very very simple mod that reduces the fog, but I tried to make it so that it doesn't look unreal. When I look at the sea, I don't see fog, I see the horizon between sky and sea. Screenshot is self explaining.
It affects only Extra Sunny weather for now.

The parameter changed is only "fog_density" and it has been reduced by 10x. You can easly edit it as you want to find the values you like the most.

Installation in written in Readme.txt file.