Vessel means any boat, ship, barge, craft, or floating thing designed for navigation in the water except: (a) A seaplane, (b) A watercraft specifically designed to operate on a permanently fixed course, the movement of which is restricted to or guided on such permanently fixed course by means of a mechanical device on a fixed track or arm to which the watercraft is attached or by which the watercraft is controlled, or by means of a mechanical device attached to the watercraft itself, (c) A watercraft of a type designed to be propelled solely by oars or paddles, (d) A watercraft of eight feet or less in length of a type designed to be propelled by sail. A motor or other component of a vessel, whether or not detachable, shall be deemed to be part of the vessel when sold therewith.
