This nautical 1779 chart by Des Barres shows the New York Harbor around Staten and Long Island. Des Barres� chart of the harbor contains numerous key differences from an earlier chart of the area by Mark Tiddeman. This chart was made after a few drastic advances in marine surveying that allowed for safer navigation. The two illustrated landmarks shown were provided to help navigators set a particular course. Tiddeman�s chart was still being bought when Des Barres’s piece was published, but the aforementioned marine surveying advances allowed this map to gain prominence over Tiddeman’s chart.