Maritime Act Article 12

Where there is a co-owner intends to sell his shares, other co-owners may purchase such shares at the same price.Where a ship would lose her R.O.C. Taiwan nationality by reason of the transfer of any shares of a co-owner, shall be made with the consent of all the co-owners.
中文原文 海商法第12條
船舶共有人有出賣其應有部分時,其他共有人,得以同一價格儘先承買。
因船舶共有權一部分之出賣,致該船舶喪失中華民國國籍時,應得共有人全體之同意。

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