The Administrative Regulations on the Ship Radio Station Article 11

The transmission for distress call and message, urgency call and message and the message of emergency positioning-indicating radio beacons of the ship radio station should be operated under the instruction of the captain or his designated representative.
中文原文 船舶無線電臺管理辦法第11條
船舶無線電臺之遇險呼叫與遇險通報之發送、應急指位無線電示標通報之發送以及緊急呼叫與緊急通信之發送,應經船長或其職務代理人指示,始得為之。

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