Gerritsz was the Cartographer in Ordinary to the East India Company, and this map covers the extent of Dutch discoveries 1616 - 1622 from Cape Leeuwin to Tryal Rocks and Exmouth Gulf detailed from the documents of the Company. "Met Octroy van de H.M.H. de Staten Generael der vereenighde Nederlanden."
Data from this map were incorporated in Eckerbrecht's world map of 1630. West coast of Australia was discovered by Dirck Hartog with the ship Eendracht in October 1616.