btw, yes i did try changing noise scale but for such big objects it gives no effect. I initially tried with an extremely big plane (typed in like 999999999999999 and it changed it to the max value(?)) but even with something less big it just doesn't work.
I have to guess you made the plane that big without increasing the height and width segments - if you have a noise that works well on a normal plane (400x400 with 20 wide 20 height segments) each segment is 20x20 units. If the noise is what you want with that, the segments need to remain 20x20 units, so if you make the plane 10 times bigger you need to have 10 times more segments each direction so they stay the same 20x20 units in size
Yeah, it worked. Though i reached it's limits - 20000x20000 sizes / 1000 segments and sadly i need something to reach the horizon and FYI my camera i use is also 20000 cm higher than the water (plane).