120.550—General alarm systems.
        
        (b) 
         A vessel of more than 19.8 meters (65 feet) in length with overnight accommodations for more than 49 passengers must have a general alarm that meets the requirements of  § 113.25 in subchapter J of this chapter.
    
    
        
        (c) 
         The public address system required by  § 121.610 of this chapter may be used to sound the general alarm signal.