Vessels using telegraph between the pilothouse and engineroom shall also be fitted with a voice tube or sound-powered telephone for the purpose of conversation between pilothouse and engineroom. Vessels equipped with wheel house engine controls shall have an alternate means of communication which may be telegraph, voice-type, or power phone between pilothouse and engineroom.History: Bd. of Mar. Insp. Regs., eff 16 Oct 72. § 4.10.