Every vessel shall be equipped with a suitable radio telephone, or with radio transmitter and receivers to send and to receive. Such equipment is to be properly maintained and in work order. A radio check is a requirement not more than 1 hour before departure. Vessels underway shall guard at all times the International Radio Telephone Frequency of 2182 M.H.C. All calls shall be entered in a logbook and a copy shall be filed with Pago Pago Communication Center upon arrival in Pago Pago.History: Bd. of Mar. Insp. Regs., eff 16 Oct 72, § 4.09.