This is one of 262 drawings and 2 paintings presented to the Museum by the artist's family in 2012, and related to John Kingsley Cook's wartime service in the merchant navy between December 1940 and August 1945. It is drawn on the back of a piece of a navigational chart showing soundings, graticule and compass rose. The fragment is part of left hand edge of the chart. The adress of the sitter is inscribed in pen.