Seafarer's Service Regulations Article 51

Personnel of the telecommunications department shall assume responsibility of all communication tasks pursuant to the master’s orders.On board ships without full-time telecommunications personnel, the telecommunication tasks shall be the responsibility of a deck officer that has a GMDSS general operator’s certificate of competency.
中文原文 船員服務規則第51條
電信人員秉承船長之命負責一切通信聯絡事宜。
船舶未配置專任電信人員時,得依規定由艙面部門甲級船員領有通用值機員適任證書者兼任之。

English translation for reference only; the Chinese text prevails. Not legal advice.