Rare Admiralty chart of Courland Bay, Tobago.

The survey was carried out by James Langley master R.N. aboard H.M.S. Scamander, captained by William Elliot.

John Walker, founding member of the Royal Geographic Society, was a leading mapmaker and engraver working in London in the first half of the nineteenth century. He is known to have produced numerous charts for James Horsburgh and the Admiralty.