The wreckage that can still be seen in the mud near Thorney is not in the Emsworth Channel - it is in the Thorney Channel about 200 yards south of Prinstead point.
Park near Thornham marina and walk south along the seawall until you get to the stile, it is only a few yards offshore.
The harbour office at Itchenor have some bits picked up over the years from the harbour, including a drift computer designed to strap on a pilot's leg