Final answer:
Certain types of boats must be registered to operate on PA waters, including motor-powered boats, personal watercraft, and sailboats over a certain length.
Step-by-step explanation:
In Pennsylvania, certain types of boats must be registered in order to operate on PA waters. This includes motor-powered boats, personal watercraft (such as jet skis), sailboats over a certain length, and boats that are used for commercial purposes. It's important to note that non-motorized boats, like canoes and kayaks, do not need to be registered.