The Ship Registration Law Article 25

If the registration of an alteration of right involves any third person's interest, an application for collateral registration shall be made on the application form, attaching the letter of consent issued by the third person.
中文原文 船舶登記法第25條
權利變更之登記,與第三人有利害關係時,應添具第三人之承諾字據,連同申請書,申請附記登記。

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