Wouter,
The boat in big waves looks much the same regarding spray the real issue is getting footage of it to prove it.
I was in a 6 metre power boat (with a 65 on back) and when the wind increased and we got into the rough stuff we had a lot of trouble keeping up and no chance of filming. Darn shame.

BTW:- I sould have posted some credits with the video.
Marcus and Karina are sailing the boat and Chris is driving the power boat so I could shoot the film.

I know that the voices in my head aint real,
but they have some pretty good ideas.
There is no such thing as a quick fix and I've never had free lunch!