The Ninth Order of the Sentry specifies calling the Officer of the Deck in which circumstance?

The Ninth Order of the Sentry emphasizes the importance of reporting situations that may arise which are not specifically covered by established instructions or orders. This means that when a sentry encounters an unusual or uncertain circumstance that requires further guidance or interpretation of the rules, it is crucial to call the Officer of the Deck. This ensures that the proper authority can evaluate the situation and provide direction, maintaining security and order in the area of responsibility.

This approach helps prevent misunderstandings or mistakes that could arise from making decisions without authorized information or guidance. In any military setting, clarity and chain of command are vital for operational success. Although other options touch on various aspects of sentry duties, the essence of the Ninth Order is about recognizing the limits of one's instructions and the need to seek help from a superior when those limits are exceeded.