What does the term 'impeller' refer to in boating?

The term 'impeller' refers to a device that propels water out from the jet drive, making it crucial for the propulsion system of jet boats and personal watercraft. When the impeller spins, it creates a high-pressure environment that draws water into the pump and then forces it out through a nozzle. This action generates thrust, allowing the boat to move forward. Understanding the function of the impeller is essential for boat maintenance and operation, especially when troubleshooting propulsion issues.

The other options do not accurately describe the impeller's role in boating. While components that draw in air can be part of various systems in a boat, they do not pertain to the impeller's function within the jet drive. Similarly, a navigational tool is unrelated to propulsion, and a safety feature, while critical to boating, does not describe the mechanical function of an impeller.