What of these must have an Iowa Registration Certificate and registration decals to operate legally on public waters?

In Iowa, motorboats and personal watercraft (PWCs) must have an Iowa Registration Certificate and display registration decals to operate legally on public waters. This requirement applies to vessels powered by motors, including those with electric motors, while canoes, kayaks, and non-motorized vessels do not require registration. It's essential for boaters to ensure their registration is current and properly displayed to comply with state regulations.