Patryn of Elvenshae said:
3-4 PCs, none of whom have ranks in Profession (Sailor), are going to get lost, run aground, and / or otherwise lose their ship very, very easily.
Getting lost and running aground are both functions of survival, not profession(sailor).
Stopping the ship without running aground is probably profession(sailor)
Turning the ship quickly is probably profession(sailor)
IMHO, skeletons would make a good crew IF under the direct command of someone who knows what they're doing. Primarily all they do is decrease the manpower requirements.
Personally, I'd tell the PC's that they're going to have hard going doing it with as few people as they've got unless they come up with a good plan.
Then I'd wait until they had a plan that I thought was good enough.
Chances are your PC's can summon monsters, use telekinesis, animate the dead and the like.
Anyone with survival is probably better at it than the ship's captain.
Anyone with balance, climb and jump is probably better at it than the crew, and are probably stronger to boot.
Let them stop the ship. Let them think up a plan.
Don't railroad them into releasing the crew.