Translation guide
The primary open deck of a ship, often the uppermost continuous deck. In Japanese, this is typically expressed with specific nautical terms.
The main continuous deck of a vessel, usually the highest deck extending from bow to stern.
Standard nautical term for 'main deck'. Used in formal and technical contexts.
主甲板に集合してください。
Please assemble on the main deck.
Loanword from English, commonly used in casual or modern contexts, especially on cruise ships or in fiction.
Literally 'upper deck'. Can refer to the main deck in some contexts, but more precisely means the uppermost continuous deck. Use with caution as it may not always equate to 'main deck'.
May not always correspond exactly to 'main deck' in all ship types.
上甲板の清掃を行います。
We will clean the upper deck.
In everyday conversation about cruise ships or ferries, メインデッキ is widely understood. In technical or official maritime contexts, 主甲板 is preferred.
メインデッキでパーティーがあります。
There's a party on the main deck.