Pieter Groos (1616-1675) was one of Amsterdam’s best-known bookdealers who was also responsible for the publication of several volumes of nautical charts and nautical handbooks. Between 1650 and 1678, he published 21 editions of the “Zee-Spiegel” in three languages, among them the rare Spanish edition of 1669. The overview maps of the North Sea and the Baltic Sea from the “Atlas de la Mar” are mostly based on maps from the “Zee-Atlas” of Goos’ Amsterdam competitor Hendrick Doncker.