Section 120.550 - General alarm systems(a) All vessels with overnight accommodations must be equipped with a general alarm system.(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.