LONG SAND HEAD TWO-WAY ROUTE Only to be used by vessels entering or leaving Medway/Thames ports that meet certain pilotage requirements. This route may also be used by any vessel less than 20 metres in length, any sailing vessel, any vessel engaged in fishing activity or licensed dredgers working in designated extraction areas,irrespective of their port of origin/destination. For details, consult Admiralty Sailing Directions/Sunk VTS.