Preliminary Sketch Showing the Positions of Davis's South Shoal and Other Dangers Recently Discovered by The Coast Survey and the soundings on the Old South Shoal, Bass Rip, Old Man, Pochick Rip, &c.

Chart of Davis's South Shoal and Other Dangers Recently Discovered by The Coast Survey and the soundings on the Old South Shoal, Bass Rip, Old Man, Pochick Rip, etc. The chart maps the various rocks and shoals in the area including many bearings associated with each. Depths are shown by gradient tints and soundings.
Interesting discoveries on the map. 1846-1851. Includes bearings, distances, tides and tidal currents, and bottom types.
Massachusetts, Nantucket Shoals

IMPORTANT NOTE:

All of our United States Coast Survey (USCS), United States Coast & Geodetic Survey (USC&GS), and similar maps and charts have been professionally unfolded and flattened using humidity baths, semi-permeable membrane, and drying blotter techniques. Most others you typically see on eBay have not been, and worse, are quickly and crudely unfolded for the low-quality photos you see. Unfolding these maps in that way is damaging and weakens them. Please be aware.