Particular map of Boston Harbor with soundings for sand banks, rocks, approaches and other directions useful for navigation, reduced from the English map of J.E.S. DesBarres, squire. Magnetic declination observed to be 6 degrees, 4 minutes in October 1778 by the Marquis de Chabert who also determined on land, the latitude of various point on which this map is adjusted. Drawn at the General Depot of Maps, Plans and Journals of the Navy for vessels in service of the King by order of M. de Sartine, State Councilor, Minister and Secretary of State with the Department of the Navy

Map of the Boston Harbour after the 1st state of J. F. W. DesBarres map, but in a reduced scale and with additional observations by Chabert. It is notable that it credits DesBarres given the French had sided with the Colonies in the War of Independence and credit was not often documented during this period.Elevated areas are hachured, forests and built up areas are depicted pictorially to delineate property separation. Banks are depicted with stippling and water depth measurements are also provided. Distant measurements are also presented on the map between points labeled in letters. Map scale is in Nautical Miles and Statute Miles. Map uses Paris Meridian