Here's a rather large piece of clipart of a pirate ship, this one complete with the jolly roger flag flying and sails at full mast.
A pirate rowboat for a captain and a very small crew ;)
A medium sized ship flying a pirate flag and with cannons.
No ship would be complete without a captain at the navigating the boat, so here's a small image of a nautical steering wheel spinning wildly.
Here's a black and white image showing a stylized ship's anchor.
Here's another style of a ship's anchor.
An animated clipart showing a more detailed anchor with rope.
An old fashioned compass to find your way across the seas.