I guess it's not used to spray the boat, but the water surface. I'm no expert on this matter, but I think it breaks surface tension somewhat. I have seen peopl

I guess it's not used to spray the boat, but the water surface. I'm no expert on this matter, but I think it breaks surface tension somewhat. I have seen people disturb the water in a pool before a high diver jumps, so I think this applies here aswell.