What does the signal red over green indicate?

The signal red over green indicates "Sailing." This signal is used to communicate the status of a vessel at sea. When a sailing vessel is displaying this signal, it signifies that the vessel is in sail mode, actively using its sails for propulsion rather than relying solely on engine power.

In maritime signaling, the color configuration is essential for other vessels to quickly and easily understand a vessel's operational status. "Red over green" is a visual cue that makes it clear to other mariners that they are not just under power but are actually under sail, which helps ensure safety and proper navigation in shared waters.

Other choices, while related to different vessel statuses, do not accurately describe what red over green conveys. This makes "Sailing" the correct interpretation of this signal.