What does the Third Substitute flag signify?

The Third Substitute flag signifies that the Commanding Officer is not on board the vessel. This visual signal is an important communication tool at sea, indicating to other vessels and nearby personnel that the CO is ashore, which can affect command and operational decisions on board. In naval operations, knowing whether the CO is present is crucial for the chain of command and the legitimacy of operational directives. Effective use of flags for communication helps maintain clarity and safety in naval operations.

The other options represent different flags and signals used during various situations but do not align with the meaning of the Third Substitute. Understanding these distinctions in flag signaling is essential for effective management and operational readiness aboard naval vessels.