The New Netherland Company also ordered a survey of the Delaware Valley, and Cornelis Hendricksz of Monnickendam explored the "Zuyd Rivier" (South River) in 1616 from its bay to its northernmost navigable reaches. His observations were preserved in a map drawn in 1616. Hendricksz made his voyages aboard the "IJseren Vercken" (Iron Hog), a vessel built in America. Despite the survey, the company was unable to secure an exclusive patent from the States General for the area between the 38th and 40th parallels.