This original nautical chart of the Entrance to Nantucket Sound, dated 1877, is from the U.S. Coast Survey collection. These charts were intended for navigational purposes by sea captains and included information relative to tides, soundings, lighthouses, sailing directions with noted danger areas and other pertinent data. This chart is tinted and in good condition with minor foxing from a previous repair. The framing is done to conservation standards with an attractive burl wood frame.