What kind of machine allows a single sailor to turn an entire ship with the ship and wheel and how does it work?

The machine that enables a single sailor to turn an entire ship using the ship's wheel is called a "steering gear" or "helm." This system typically consists of a wheel connected to a series of gears and hydraulic systems that amplify the force applied by the sailor. When the sailor turns the wheel, the motion is transmitted through these components, which move the rudder, allowing the ship to change direction. Modern vessels often use electronic or hydraulic steering systems for greater efficiency and ease of handling.