Which of the following is NOT a required deck log entry while in port?

The correct choice identifies weather forecasts as not being a required deck log entry while in port. In naval operations, the deck log serves as an official record of significant events and conditions affecting the ship's operations. Required entries typically include observations that have direct implications for shipboard safety, readiness, and operations, such as morning and evening colors, the arrival of command personnel, and any casualties involving the ship.

Morning and evening colors signify respect and are a standard practice in naval customs, so recording these events in the log is essential for documentation. The arrival of command personnel is also critical, as it affects the command and control structure aboard the ship. Casualties, which may refer to injuries or damage aboard the vessel, must be logged promptly since they can have immediate operational impacts and require follow-up actions.

In contrast, while weather forecasts are important for planning and operations, they are typically recorded through other channels or systems and do not constitute a necessary entry in the deck log when the ship is in port. This separation helps maintain clarity in the log, focusing on immediate and direct concerns related to the ship's operation rather than broader environmental conditions that may be documented elsewhere.