Telecommunications Act Article 54

Except for distress communications, radio station of ships or aircrafts entering the territorial waters or airs of the R.O.C. shall not communicate with radio stations not designated by the MOTC.
中文原文 電信法第54條
船舶或航空器進入中華民國領海或領空時,其電台不得與未經交通部指定之無線電臺通信。
但遇險通信不在此限。

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