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on indicators in the Director tower, or on later variants, the HACS could move the entire Director through Remote Power Control so that it could continueHigh Angle Control System (HACS) was a British anti-aircraft fire-control system employed by the Royal Navy from 1931 onwards and used widely during World War II. HACS calculated the necessary deflection required to place an explosive shell in the location of a target flying at a known height, bearing and speed.