Final answer:
Navigation rules dictate that several safety items are required on board a 22 foot powerboat, including life jackets, fire extinguishers, and more, with specific requirements varying by region.
Step-by-step explanation:
According to navigation rules, there are several items that must be on board a 22 foot powerboat for safety and legal compliance. These items often include life jackets for all passengers, fire extinguishers, visual distress signals, a horn or whistle, navigation lights, and a throwable flotation device. It's important for operators to consult the latest coast guard regulations or navigation rules specific to their region, as requirements can vary depending on the size of the boat and the waters where it is operated.