Which flag would indicate that a vessel is preparing to embark on a journey?

The flag that indicates a vessel is preparing to embark on a journey is known as the "One Flag." This flag signifies that the vessel is preparing to get underway, which is a crucial part of maritime communication. The use of different flags helps convey specific messages on the water, and the One Flag serves as a clear signal of readiness for departure.

Understanding maritime flag signals is essential for effective communication between vessels and can be critical for safety and coordination at sea. In contrast, the other flags mentioned typically convey different meanings related to specific situations or statuses rather than indicating readiness to embark.