Regulations for Ratifying the Employment of R.O.C. Seafarers by Foreign Employers Article 6

Any foreign employer who would like to transfer an employed seafarer to another vessel or to borrow a seafarer employed by another foreign employer shall first obtain the consent of the seafarer and re-sign the employment contract. The current foreign employer shall submit the re-signed employment contract, together with the list of seafarer information, to the Maritime Administration within 15 days for reference. However, if the foreign employer remains unchanged, the years of employment shall not be interrupted.
中文原文 外國雇用人僱用中華民國船員許可辦法第6條
外國雇用人將僱用之船員改調他船或調用其他外國雇用人僱用之船員時,應取得該船員之同意,重新簽訂僱傭契約,由現僱用之外國雇用人於十五日內將新簽訂之僱傭契約併同船員資料名單報航政機關備查。
但調用前後之外國雇用人相同者,其僱用年資不中斷。

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