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This is a roughly drawn field sketch of the north bank of the Thames, extending from West Thurrock, at the bottom, to Great Warley, at the top. The plan is made up of about 13 irregularly cut pieces of paper watermarked "1794". Some mismatch of detail is noticeable along the edges where the sheets have been joined, and the orientation of the lettering on the component parts is varied. Trigonometrical stations, from which the surveyors took angular readings, are marked 'flag', notably at 'Bulvan Fenn' and just above the low water mark for the Thames.