A chart of the Atlantic Ocean exhibiting the course of the Gulf Stream
Duane, William (Publisher)
1808

This rare map is a copper engraving showing the coasts of North America, Europe and northwestern Africa. This is the first published map to show the gyres and branches of the Gulf Stream with the northernmost part going to Iceland and Norway then down to England and Ireland and returning to the southern Atlantic as the North Equatorial Current. A southern portion follows the path shown on earlier maps headed toward Africa, but not reaching its shore. DeBrahm's 1775 chart shows a circular pattern of the north equatorial current.

Duane took over Benjamin Franklin's printing company when Franklin retired. The cartographer is unknown, so the map is known as the "Duane Map." However, he is best known as an editor of the Aurora, a Democratic paper published in Philadelphia.