Where does the new East River corridor start now?

I got out my trusty New York TAC to see where this thing starts, since I
hope to fly some friends up the Hudson Sunday. It's not clear what happens
just south and north of the southwestern tip of Governor's Island. Do you
draw a straight line from the southwestern tip to the nearest point on
Manhatten, and that line defines the East River Corridor? Do you draw the
line tangent to the west shore of Manhatten? What about south of Governor's
Island? It would have been a lot easier to understand and follow if they'd
used a straight north/south line touching the northeast tip of Governor's
Island. I think I'll ask AOPA to try and get an interpretation and perhaps
a graphic on this.
--
Bob (Chief Pilot, White Knuckle Airways)