The Law of Ships Article 68
In the event that a registered yacht is lost or wasted, loses its R.O.C. nationality, has been missing for more than six months or sunk and unable to be salvaged or repaired, the owner of the yacht shall apply for cancellation of the yacht's certificate or registration to the shipping administration authority at the port of registry or place of registration within 4 months from the date of discovery or occurrence of such facts. The Certificate of Yacht and Certificate of Registry shall then be withdrawn, unless they have been lost.
中文原文 船舶法第68條
經登記或註冊之遊艇，遇滅失、報廢、喪失中華民國國籍、失蹤滿六個月或沉沒不能打撈修復者，遊艇所有人應自發覺或事實發生之日起四個月內，向船籍港或註冊地航政機關辦理遊艇註銷登記或註冊；其遊艇證書及船舶登記證書，除已遺失者外，並應繳銷。