Which vessel would display a cone, apex downward?

The display of a cone, apex downward, is a specific day shape used by vessels as a visual signal to indicate their method of operation. When a vessel is proceeding under sail and using machinery, it demonstrates this by showing the cone shape. This alert is particularly important for other vessels on the water as it helps them understand the vessel’s capabilities and navigate safely around it.

A vessel under power alone usually displays a cylinder shape, indicating that it is not using sail. A fishing vessel typically displays a different day shape, specific to its activities, such as two cones apexes together. A vessel that is drifting would display a ball shape, not a cone. Thus, the cone with the apex downward is clearly reserved for those vessels that are simultaneously sailing and using their engine power, reinforcing the message it must convey to other boats in the vicinity.