How to get 2 guns for the dream voyage?

You can get 2 guns of Dream Back to the Great Navigation by purchasing and exchanging them at the trading center.

A Complete Collection of Ways to Obtain Maritime Treasures on the Great Sailing

Arabic Ancient Books (Green)-East India and Basra are not far from the right.

Gemstone earrings (green)-the periphery of the upper left island in Cape Town, South Africa.

gentleman's hat (green)-western Europe, the coast below Calvi.

Solomon amulet (green)-Eastern Europe, Beirut, the upper right corner falls.

quiver (green)-Eastern Europe, in the upper left bay of Kafa.

bluestone Yu Pei (green)-the entrance to the right bay below Manila in Southeast Asia.

deer hunter suit (blue)-northern Europe, the coast above Hamburg.

Death axe (blue)-Eastern Europe, the coast above Famagusta.

Herb bag to ward off evil spirits (blue)-West Africa, cap vert, the upper left reef.

poison-quenching spear (blue)-the corner of the lower right coast of West Africa and Sierra Leone.

Jasper Flower (Blue)-Southeast Asia and the upper right island coast of Brunei.

Gloves for Throat Chokers (purple)-Northern Europe, above Dublin.

exquisite hand shield (purple)-the lower left sea area of the Caribbean and maracaibo.

golden helmet (purple)-the corner of the lower right coast of West Africa and Sierra Leone.

gradual kaleidoscope (purple)-the right side of the right island in South Africa and Mozambique.

octave (purple)-the Caribbean and the coast above Santo Domingo.

phoenix dance bronze mirror (purple)-East Asia, the bay above Pohang.

Scottish bagpipes (purple)-the lower right corner of Iceland, just north of Dublin.