Lord Baltimore commissioned the Bohemian-Dutch merchant Augustine Hermann to produce a map of his Maryland colony in exchange for a large land grant near the head of Chesapeake Bay. Hermann’s map was published in England in 1670.
In his A Biography of a Map in Motion: Augustine Herrman’s Chesapeake, Prof. Christian Koot uses contemporary accounts of Dutch and English navigation, land survey, and maritime map-making methods to imagine how Hermann gathered data and produced his map.
How accurate was Hermann? I used GIS software to find out.
I laid two prominent points from the Hermann map over GPS ground truth shown in a modern basemap — Elk Neck Point near Hermann’s Bohemia Manor in the north and Cape Henry at the mouth of the Chesapeake in the south.