According to the April 3, 2008 issue of The Fisherman the line is defined on the Home Port Chart #42. This chart is available at tackle shops that can be found on their website
www.homeportcharts.comIt is as follows:
A line from the flashing marker at Great Beds (N40 29.203, W74 15.188), NE 082ยบ through the Romer Shoal Light (N40 30.777, W74 00.821) and continuing across Ambrose Channel.
From there runs parallel to channel (on the NY side) in a SE line out 3 miles to federal waters.
This info took me some time to find as no one seemed to know tha answer. A very helpful sales person at West Marine called Karen who works at The Fisherman and she was kind enough to give me a back issue.