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The two sketches here are quite separate, and drawn with the sketchbook different ways up. The panorama of the Thames and Medway overlooking Sheerness is drawn with the book inverted, and may be further extended on folio 69 (D06471; Turner Bequest XCIX 65). In his picture Margate exhibited at his Gallery in 1808 (Tate T03876; displayed at Petworth House),1 Turner included as foreground narrative a Hastings fishing boat similar to the one sketched here being hailed and intercepted by Margate wherries.
Martin Butlin and Evelyn Joll, The Paintings of J.M.W. Turner, revised ed., New Haven and London 1984, pp.59–60 no.78 (pl.88).