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RAF personnel learning navigation during the Second World War, 1941. 'Navigation is one of the subjects which follow the pupil from the earliest moment right through to the most advanced stages of his training. In this field, as others, clear exposition with the aid of appropriate models is sought'. From "The Royal Air Force in Pictures", 2nd edition, by World War I flying ace Major Oliver Stewart. [Country Life Ltd, London, 1941] (KEYSTONE/HERITAGE IMAGES/The Print Collector)