Maritime Act Article 19

No mortgage or sale of the ship shall be effected by the co-owned ship’s husband unless he has been authorized by co-owners in written in accordance with Article 11.No restriction imposed by co-owners upon such delegated authority of a ship’s husband can be set up against a bona fide third person.
中文原文 海商法第19條
共有船舶經理人,非經共有人依第十一條規定之書面委任,不得出賣或抵押其船舶。
船舶共有人,對於共有船舶經理人權限所加之限制,不得對抗善意第三人。

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