All spelljamming vessels are equipped with a motive power source, the spelljamming helm. Helms come in all shapes and varieties; most, however, are actual physical helms worn by the helmsman of the vessel.
Operation of a spelljamming helm requires the feat Helm Operation and requires the helmsman to give up a daily slot of his or her choice while operating the vessel. The higher the daily slot, the higher the vessel’s operation rating will be. Operation ratings of vessels are used for purposes of maneuverability, speed, and so on.