A throttle on a boat is a control that is used to increase or decrease the speed of the boat. It is a vital component in controlling a fast boat, and it works similarly to the accelerator on a car. The throttle control is usually marked with a red knob and is located on the boats shifter. The throttle arm also acts as a tiller to turn the engine, which gives the boat direction. The throttle control is different on every boat, so it is essential to get to know how it works. When operating the throttle control, it is important to keep both hands on the clutches to avoid accidentally grabbing the throttles.