46 CFR § 113.30-3 - Means of communications.
(a) An emergency means of communication required by this subpart must -
(1) Be comprised of either fixed or portable equipment; and
(2) Provide common talking means of two-way voice communication and calling among the navigating bridge, emergency control stations, muster stations, embarkation stations, and other strategic positions listed in § 113.30-5.
(b) The means of communication and calling must be a reliable means of voice communication and must be independent of the vessel's electrical system.