What action does the signalman on the receiving ship indicate with a GREEN signal device moved in a continuous circle overhead?

The action indicated by a GREEN signal device moved in a continuous circle overhead signifies "Increasing pumping pressure." This signaling is part of standard communication procedures used between vessels during operations that involve fluid transfer, such as refueling or transferring ballast.

When the signalman uses this specific green signaling action, it communicates to the sending ship that they should increase the pressure of whatever fluid or material is being transferred. This is crucial in ensuring that the transfer is conducted safely and effectively, allowing for optimal flow rates and preventing any operational disruptions during the process.

Understanding these signals is essential for effective team coordination and safe operations at sea, as they help to communicate vital information quickly without the need for verbal communication, which may be hindered by noise or distance.