What is indicated by the Tango Flag?

The Tango Flag signifies "Do not pass" or "Keep clear." This flag is part of the International Code of Signals, which maritime vessels use to communicate important messages to one another. Specifically, the Tango Flag advises other vessels to maintain a safe distance because the ship displaying the flag is likely engaged in operations that may hinder normal navigation, such as transferring personnel or cargo.

The other options suggest different scenarios that are communicated by different flags or signals. For example, "Preparing to replenish" would typically be indicated by a specific flag or signal associated with the activity of taking on fuel or supplies, while "Man overboard" has its own distinct signal to alert other vessels of a person needing immediate assistance. Lastly, "Medical assistance required" is communicated through a different signal to ensure urgent medical response is understood by surrounding vessels. Understanding these signals is crucial for maritime safety and effective communication at sea.