This mid-nineteenth-century progress sketch was published by the United States Coast Survey under the direction of Superintendent Alexander Dallas Bache. Designated as Section No. 2 of the federal coastal survey program, the chart documents geodesic and hydrographic survey advancements undertaken between 1844 and 1851 across the Delaware River, Delaware Bay, and southern New Jersey coastline. The map meticulously illustrates primary and secondary triangulation stations, baseline networks, and trigonometric linkages stretching from Philadelphia and Wilmington south to Cape Henlopen and Cape May. Prominent maritime navigational hazards, including sandbars, channels, and named shoals (such as Joe Flogger Shoal, Brandywine Shoal, and Cross Ledge), are systematically charted alongside inland transport routes and regional coastal geography.