I think the sails are only their for show, and in my opinion so does it looks much better if the sails are taken down, like how the sailing boats was in ss08. Now it makes the game look more unrealistic than what it already is. I also think that the fenses or rails(or what the name is in english), should be folded up. Now they are down, so a helicopter can land, but when there is no helicopter they should be up.
There is also a bug with this ship, or at least in one of the Greenpease missions. When the deploy boats are used and lifted up on the deck again, so do the water cannon disappear(at least if they are used). You can use them if you deploy them again, but you can not see the water cannon when they are on deck.