With the page turned vertically, the upper half is taken up with two small seascapes, separated by a horizontal pencil line. Masts and sails are visible beyond the swelling waves, comparable with those in the painting East Cowes Castle, the Seat of J. Nash, Esq.; the Regatta Beating to Windward, exhibited at the Royal Academy in 1828 (Indianapolis Museum of Art),1 which also includes a buoy like the one seen at the bottom right here, as well as a distant moored warship, like the one apparently shown in the upper sketch here. The second sketch is annotated with colours and other comments.
At the bottom left is beside an isolated study of a yacht sailing in calmer circumstances. For more on studies in this sketchbook relating to the regatta events at Cowes from late July 1827 onwards, see the sketchbook Introduction.
Martin Butlin and Evelyn Joll, The Paintings of J.M.W. Turner, revised ed., New Haven and London 1984, p.150 no.242, pl.246 (colour).