England - East Coast. Sheerness and approaches. Surveyed by Commander P.S.E. Maxwell, R.N. Assisted by Lieutenant Commander J.P. Cary, Lieutenants R.A. Stephens, A. Jones, D.G.V. Williams & W.H. Dickinson, R.N., H.M. Surveying Ship "Kellett" 1925. Outer soundings from surveys by the Port of London Authority to 1929. Outer Bar to Garrison Point re-sounded by Lieutenant Commander N.A.C. Hardy, R.N., H.M. Surveying Ship "Kellett". Topography is taken chiefly from the Ordnance Survey