When must the Certificate of Boat Registration (registration card) be carried on board a vessel?

The Certificate of Boat Registration must be carried on board a vessel whenever the boat is being operated on the water. This document serves as proof of ownership and verifies that the vessel is registered with the appropriate authorities. Failure to have the registration card on board can result in fines or penalties during a routine inspection by law enforcement or regulatory agencies. It's essential for boaters to keep this document accessible while navigating.