Langstone Harbour, Hayling Island Portsmouth sea coast chart. ADMIRALTY 1943 map'Langston Harbour. Le Chateau Blanc. Lat. 50 47' 09" N. Long. 0 59' 14" W. mag. var. 10 20'W.(1943) decreasing about 10' annually. Soundings in feet (reduced approx. to the level of Mean Low Water Springs) Mean H. W. Springs 13 Fort. Mean H. W. Neaps 10 Fort. Natural scale 1 56,200'
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