the English Channel printed on tick paper to be used at sea. The divider holes prove that is has been used as an atlas on sea. Doncker’s charts were the most up-to-date in the second half of the seventeenth century. Although there is some similarity to those charts published by Van Loon, Goos, Lootsman, and Doncker, the latter’s charts are original. More frequently than … [his] contemporaries, Hendrik Doncker corrected and improved his charts. He often replaced obsolete charts by new ones … This consciousness of the high demands of correctness is reflected by the development of Doncker’s sea atlas