174.31—Terms imposed by States for numbering of vessels.
         A State numbering system may condition the issuance of a certificate of number on—
    
    
        
        (a) 
         Title to, or other proof of ownership of a vessel except a recreational-type public vessel of the United States; or
    
    
        
        (b) 
         Proof of liability insurance for a vessel except a recreational-type public vessel of the United States; or
    
    
        
        (c) 
         The payment of State or local taxes, except for a recreational-type public vessel of the United States.