According to the Navigation Rules, which must be aboard a 22-foot powerboat?

In accordance with the Navigation Rules, a 22-foot powerboat must have a whistle or horn aboard. This requirement is in place to ensure that the vessel can effectively communicate with other boats, especially in situations where visibility is poor or when navigating congested waterways. Sound signals are crucial for signaling intentions and avoiding collisions, as they convey important information to other boaters about your presence and actions on the water.

While a life raft, emergency beacon, and flares can be essential for safety under certain conditions or in specific circumstances, they are not mandatory for a 22-foot powerboat under standard regulations. The whistle or horn serves as a basic safety and communication tool that is readily required on vessels of this size to enhance maritime safety.