In 1735 Walter Hoxton, on his chart of Chesapeake Bay, gave an early and accurate description of the western Gulf Stream. Hoxton's pioneering measurements by ship-drift of the mean limits, direction and speed of the Gulf Stream were the first to show that the Stream is a narrow, swift boundary current which leaves the coast near Cape Hatteras. and turns eastward near 38N latitude. The Hoxton description of the Stream antedates by 35 years the Franklin-Folger chart of the Stream.
Richardson, P. L.. 1982. "Walter Hoxton's 1735 description of the Gulf Stream." Journal of Marine Research 40, (S). https://elischolar.library.yale.edu/journal_of_marine_research/1658