What does it mean when the signalman holds a RED signal device in the right hand and a GREEN one in the left, crossing both hands overhead?

When a signalman holds a red signal device in the right hand and a green one in the left, crossing both hands overhead indicates that the replenishment operation is complete at that station. This signaling technique is imperative for ensuring effective communication, especially during complex operations such as replenishments at sea where it is crucial to communicate the status of operations clearly and quickly to other vessels involved.

The red and green colors are a standard in maritime signaling, with red typically symbolizing a stop or danger and green often indicating go or safety. By crossing both signal devices overhead, the signalman communicates a specific status to the crew or other vessels, signifying that they can safely proceed with operations or be assured that the replenishment activity has been finished at that particular station. This helps to maintain safety and efficiency in high-paced maritime environments.