Which requirement is NOT mandated by the Harbor Safety Plan Standards of Care in good weather?

The correct choice highlights that ensuring all crew members are on deck is a requirement that is not mandated by the Harbor Safety Plan Standards of Care in good weather. The focus of the Harbor Safety Plan is on maintaining navigational safety and effective communication during vessel operations, particularly under varying weather conditions.

Selecting the option regarding crew members positions reflects an understanding of the standards in place that primarily concern navigation, communication, and awareness of vessel conditions. Requirements such as maintaining a 24-hour bridge watch by an English-speaking individual and confirming a vessel's position and under keel clearance at least once per hour are critical for ensuring safe navigation. Additionally, providing notifications as required by the VTS User Manual ensures that all necessary parties are aware of vessel movements and conditions.

In essence, the requirement about crew members being on deck does not directly address the core safety and navigational protocols that are critical for good weather conditions, making it not mandated by the Harbor Safety Plan Standards of Care.