The fishing vessels first used were powered by wind and oars. Since "modern" fishing in California was developed after 1850 (at about the same time as steamships) there were soon some steam-powered fishing vessels being used for longer-distance fishing in bigger boats. The steam was used both for propulsion and also for winching in nets, unloading catches, lifting and lowering anchors etc. As the diesel engines and petrol engines (gasoline engine) were developed in the early 1900s they were soon the engine of choice. Diesel engines are now the engine of choice for powering most commercial fishing vessels. Their economical operation and long lifetimes make their higher initial cost normally well worthwhile. Today many smaller and sports boats are powered by an outboard motor consisting of a self-contained unit that includes engine, gearbox and propeller or jet drive, designed to be affixed to the outside of the transom. The outboard motor provides steering control both as a movable rudder and by pivoting over their mountings to control the direction of thrust. Outboard motors have less than one horsepower to over 200 hp and are relatively easy to remove for service or replacement.