the first landing, survey and mapping of South Georgia. As mandated by the Admiralty, on 17 January 1775 he took possession for Britain and renamed the island 'Isle of Georgia' for King George III. German naturalist Georg Forster, who accompanied Cook during their landings in three separate places at Possession Bay on that day, wrote: "Here Captain Cook displayed the British flag, and performed the ceremony of taking possession of those barren rocks, in the name of his Britannic Majesty, and his heirs forever. A volley of two or three muskets was fired into the air." Nowadays the date of 17 January is celebrated as Possession Day, a public holiday in SGSSI. The group of Shag Rocks and Black Rock forming the west extremity of the British overseas territory of South Georgia and the South Sandwich Islands is situated 270 km or 150 nmi west by north of the South Georgian mainland. Probably discovered in 1762 by the Spanish ship Aurora, these rocks appeared on early maps as Aurora Islands, were visited and renamed by the American sealer James Sheffield in the Hersilia in 1819, and mapped by HMS Dartmouth in 1920. South Georgia's coast and waters have been surveyed by a number of expeditions since those of Cook and Bellingshausen. In particular, the extensive oceanographic investigations carried out by the Discovery Committee from 1925 to 1951 yielded an enormous amount of scientific results and data, including the discovery of the Antarctic Convergence. The first land-based scientific expedition on South Georgia was the 1882–83 German Polar Year expedition at Moltke Harbour, Royal Bay. During the late 18th century and throughout the 19th century, South Georgia was inhabited by English and Yankee sealers, who used to live there for considerable periods of time and sometimes overwintered. The first fur seals from the island were taken in 1786 by the English sealing vessel Lord Hawkesbury, while the first commercial visit to the South Sandwich Islands was made in 1816 by another English ship, the Ann. The sealers pursued their trade in a most unsustainable manner, promptly reducing the fur seal population to near extermination. As a result, sealing activities on South Georgia had three marked peaks in 1786–1802, 1814–23, and 1869–1913 respectively, decreasing in between and gradually shifting to elephant seals taken for oil. More efficient regulation and management were practised in the second sealing epoch, 1909–64. During the 19th century, the