Actually, the Dawn berths right next the U.S.Intrepid museum. If you follow signs on the 12th Avenue which read: To U.S. Intrepid Museum, you wil be there. Actually, the cross street is 12th Avenue and W.55th Street. If you arrive in NYC on the East Side, Take W.55th straight across town and it will bring right up the entrance for the Dawn and parking. If you arrive in NYC, on the West Side, drive down 12th Avenue and get in the far left lane around 50th Street. Be prepared for a long wait to make the left turn, long traffic light.
Hope this helps!