Which of the following is NOT a type of log that must be maintained by the In-Port Engineer Officer of the Watch?

The ship maintenance log is indeed a vital record for any vessel, particularly for the In-Port Engineer Officer of the Watch. It documents all maintenance activities, repairs, inspections, and modifications conducted on the ship’s machinery and systems. This log ensures that all maintenance is tracked, which is critical for compliance with safety regulations and for the overall operational efficiency of the vessel.

On the other hand, the other logs listed, such as the security round sheet, hot work chits, and smooth log, are also important for various operational and safety considerations but may not be formally classified as mandatory logs for the In-Port Engineer Officer of the Watch. The security round sheet tracks security inspections and rounds undertaken, hot work chits document permits for any hot work conducted, and the smooth log generally records daily operations and events in ship handling. The absence of these as necessities for the In-Port Engineer Officer suggests their specific applications may not directly pertain to engineering operations or maintenance oversight, thereby making the maintenance log essential for the officer's responsibilities.