i have found a way to get off a ship at sea and here is proof
and
and heres how i did it i got on a ship and it with almost no health so it sank as i got on when the loading screen left i was in the water swimming
and some specifics
1. i got on the ship from ila de avarica
2. the ship was a war galleon
and the problems
1. in the glitch the camera kept spinning
2. my pirate swam and ran backwards til i logged out
so tell me what you think of the glitch and if it works for you