What does a downwards cone dayshape indicate?

A downward cone dayshape indicates that a vessel is under power and is not operating solely on sail. This signaling is intended for other vessels to clearly understand the status of the ship during daylight hours. The downward cone communicates that the vessel is actively maneuvering, distinguishing it from sailing vessels that are using sails alone, which would display a different shape.

The other options do not accurately describe the meaning of the downward cone dayshape. For example, a sailing vessel under sail would utilize a different dayshape to indicate its mode of operation. Similarly, an anchored vessel would use a specific dayshape that reflects its moored status, whereas the indication of being aground is typically represented differently in navigational signals. Thus, recognizing the significance of the dayshape is crucial for ensuring safe navigation and communication among vessels at sea.