What is a throttle in a boat?

The throttle in a boat serves as the control mechanism that regulates engine power and speed. When the throttle is adjusted, it changes the amount of fuel and air flow into the engine, which directly affects how much power the engine produces. By increasing the throttle, the engine receives more fuel and air, leading to higher RPMs (revolutions per minute) and, consequently, greater speed. Conversely, reducing the throttle decreases the engine's output and slows the boat down.

Understanding the role of the throttle is crucial for operating a boat effectively and safely, as it allows the operator to control not only the speed but also the maneuverability of the vessel. This contrasts with other options which address steering mechanisms, fuel efficiency features, or speed measurement devices, none of which define the core function of a throttle.