104.295—Additional requirements—cruise ships.
        
        (2) 
         Check the identification of all persons seeking to board the vessel; this check includes confirming the reason for boarding by examining joining instructions, passenger tickets, boarding passes, government identification or visitor badges, or work orders;
    
    
    
    
        
        (b) 
         At MARSEC Level 3, the owner or operator of a cruise ship must ensure that security briefs to passengers about the specific threat are provided.