Regulations for Administrating Pilots Article 9

Boats exclusively used for pilotage services and navigating within a designated pilotage district may be exempted from processing the formalities of port entry and exit.
中文原文 引水人管理規則第9條
供引水工作所用之引水船,在指定之引水區域行駛時,得免辦進出港手續。

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