Now i'm not 100% sure if this works because it hasnt been fully tested by myself yet, but here are the steaps :
1. Get a warlock/warrior/priest (or anything that can fear) to come with you (if not priest, make sure they have nogg)
2. Slow fall from the edge off the mountain beside Bootybay
3. Land on the pole that holds the mast up on the ship
4. Start a duel on the pole and make the person who came with you fear you once the boat starts moving
5. Enjoy the ride
Once this happens your screen should make everything around u white and glitchy and it appears as though your character and speedrunning over water beside the boat. It works until you reach halfway then i think the effect stops. If your wondering why i havnt tested this, it is because i am waiting for the Blizz dl atm, and i surly will test this ASAP
Thanks for reading Glyn