Movement is so so, the real problem as Count_Crapula says is just weird.
You need to use a propper ocean/water shader.
I believe RTP has one that you can use.
It will calculate intersection with the terrain and create an alpha mask that will make the water look more transparent there, and build up foam there too, so it looks like the water is contained by the terrain not intersecting it.
I may be wrong though, it's a while since I last played around with RTP, but I remember using a decent ocean shader then, so I'd be surprised if it wasn't from RTP.
TheLogan
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