This detailed chart of the north coast of Cornwall and portion of Devon was surveyed originally by Lieutenant Murdoch MacKenzie the younger (1743-1829). He was a maritime surveyor to the Admiralty and nephew to Murdoch MacKenzie the elder (1712-97/99). He made numerous surveys of the south and west coasts of England including this one in 1772. It centres on Padstow on hte north coast of Cornwall and extends from St. Agnes in the south to Hartland Point in the north. The Depot des Cartes et Plans de la Marine was the government hydrographic service of France. It was founded in 1720 to provide the French Navy with accurate charts and was headed first by Jacques Nicolas Bellin. Tooley’s Dictionary.