Thank you, Larry. I have been learning about Long Island and the Sound in 1779, the time of this map. New York City, Staten Island, and Long Island were the only lands consistently held by British troops throughout the Revolutionary War. At that time, my 5th great-grandmother, Elizabeth Havens was maintaining the family farm on Shelter Island. Her husband, James Havens was one of thousands of sailors attacking British shipping in the Long Island Sound as privateers. A smaller number of inhabitants operated in the same way against American shipping. And British Fleets often anchored in Gardiner Bay before going to New York City, or south. While there, they would send troops ashore to take supplies from Elizabeth and the other farmers who remained.
So this map is an extremely relevant update about a focal point of naval attention at the time.