This English sea chart of the mouth of the approaches to the River Thames was first published by John Thornton in the ‘Coasting Pilot’ from about 1697. One known example of an issue dating from that year survives, as does only one known recently handled by us of an edition of 1706. His son Samuel issued a further edition in 1714 of which again only one known example survives. By 1729 the plate had been altered and Thornton’s imprint removed as here for inclusion in Mount and Page’s ‘English Pilot First Part, Southern Navigation’ in 1749. There are two insets, one of which features the River Thames upriver to London. Shirley ‘Atlases in the BL’ M.M&P 1b no. 1.