These maps were used in the cockpit during the prize-winning 27 days and 20 hours en route London to Darwin.
The planned as well as the actual route shown; pencil notes added during flight.
Their aircraft, the Vickers Vimy was one of a new generation of heavy bombers which were designed to attack German strategic targets but which failed to see active service during the First World War. It gained immortality by its successful post-war pioneering long-distance flights.
To the West of Australia there is the following mention in red. 11.500 miles, 135 hrs in air and 27 days 20 hrs.