Charts. Australia. Australia, south coast, head of Great Australian Bight to Doubtful Island Bay, coast line is from British and Australian Govt, survey in 1879-80. adjacent islands and soundings are from British survey in 1802, Esperance Bay to Pollock Reef from surveys between 1897 and 1901: chart 3425. Natural scale 1:668.970 at lat. 33°.