Regulations for Passenger Ship Administration Article 79

If the certified number of passengers is computed based on the deck area, the computation shall only include the deck areas that are provided for their exclusive use.
中文原文 客船管理規則第79條
核算乘客定額時,以甲板面積計算者,應按其專用處所之甲板面積核算之。

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