Single sheet. Coloured manuscript drawn on vellum, mounted on a modern backing sheet. Scale: [1:30,000 (lat)]. The chart has a latitude scale and shows leading and clearing lines and soundings as well as some written sailing directions. St Agnes lighthouse and ships are depicted. The scale bar is decorated with a pair of dividers.

Bayley was despatched by Trinity House in a royal yacht to erect the lighthouse at St Agnes during the summer of 1680. It is presumed the material for this chart was collected at the same time.