There is a notice on www.eastcoastrivers.com that the Knolls are encroaching on the channel north of the Mid-Knoll buoy and yachts have gone aground. There is a new version of the chartlet dated August but that has only had a note added in the area involved, not any changes to the contours.

The website states: “The Mid Knoll Buoy has been moved to position: 51° 58.759N 001° 23.411E.  This is due to the Deben Bar shingle bank migrating towards the West. The Deben Bar is on the move with particular concerns being raised over the middle section of the Knolls (North of Mid Knoll Buoy). The bank on the middle section knoll intrudes into the channel and various yachts have gone aground on the knoll on the ebb tide.  The recommendation is for yachts should keep to the West of the channel between the Deben and Mid Knoll buoys.”