Motor Boats (M/Y), also referred as Power Boats and Motor or Power Boats, are leisure vessels that are not equipped with sails. Because of the fact that Motor Boats are not powered by the wind through sails, they are in a way more independent than Sailing Boats regarding weather conditions and offer a greater cruising speed. Motor Boats have less restrictions in their design (hydrodynamics and aerodynamics), and therefore usually have larger volume bodies in both height and width and are often more equipped, especially in their interior space, than Sailing Boats. However, Motor Boats are usually more sensitive to sea conditions such as Roll, pitch and Yaw. Two major categories within the Motor Boats which do not depend on the length of the Motor Boat are: Displacement Boats and Planing Boats, which indicates the manner in which the boat sails through the water. Navigating, mooring and operating Motor Boats is considered easier than doing so with sailing Boats. Therefore the Maritime law gives Sailing vessels priority over Motor vessels. In some countries there is even a separation when licensing a skipper.