Additional day shape for fishing vessel with gear 150 meters to the side?

Answer: D — Cone pointing up

A vessel fishing with gear that extends to the side uses day shapes to show the presence and reach of its gear. The standard signal for a vessel engaged in fishing (not trawling) is two cones displayed together. When that gear reaches 150 meters or more to the side, an extra day shape is required to warn others about the long gear. That extra shape is a cone pointing up, added to the existing pair. The other shapes don’t serve this purpose. A cone pointing down, a sphere, or a diamond are used for different statuses or conditions and do not indicate extended fishing gear to the side.