I've documented that my son is scared of the wind. He's just not a sailor. So I thought that in the interest of a fair fighting chance, I'd just start him out slowly. We hang out at the boat all the time; he enjoys it there. It's just that if I make a move on the docklines or the engine key, he goes ballistic. Just freaks out.
Again, I'm starting slowly. I got agreement that we could just go the boat and motor around the marina. We'd look for cool boat names, maybe pump out the holding tank. Even show him where Polka Dot used to live. If he did it, there would be donuts. Everything was stacked in my favor. I had buy-in. He promised we'd motor around the marina right up until bed time Friday night. He went to sleep happy with the thoughts of donuts.
First thing he did when he woke up was to come into my room and yell, "NO MOTOR ROUND THE RINA!!!!" over and over. With abject fear in his eyes, panic in his voice. I pulled out the donut card and that did nothing. Absolutely nothing.
He is as terrified of that boat moving as he is of airplanes, trains, firetrucks, and that witch that lives in his closet. If donuts won't work, what will? Consider the comments section to be a suggestion box because I'm out of ideas. Other than wait or move to a landlocked city.