CORNEY REACH - NAVIGATION HAZARD - DUKE'S MEADOW BUOY OFF STATION AND PARTIALLY SUBMERGED INSIDE THE AUTHORISED CHANNEL UPRIVER OF BARNES BRIDGE: Corney Reach - Navigation Hazard - Mariners are advised that the Duke's Meadow Buoy is off station and is now partially submerged, together with its anchor and gear, inside the Authorised Channel upriver of Barnes Bridge. Mariners are advised to navigate with extreme caution in this area, keeping a sharp lookout for the buoy and gear. It is unknown if the buoy's green light remains operable. Mariners must be aware that the buoy may become totally submerged and/or move on the tide in the river. The PLA is working to rectify this situation as quickly as practicable.