 His journal entry for 29 November 1642 records that he observed a rock which was similar to a rock named Pedra Branca off China, presumably referring to the Pedra Branca in the South China Sea.The journal places Pedra Branca "about four [Dutch] miles" from the mainland of Tasmania; a Dutch mile from this period was about , thus 4 such Dutch miles would be , which is close to the actual distance of Pedra Branca from South East Cape.On 7 February 1973 "Nisshin Maru No.