Word: gyrocompasses
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Dates: during 1960-1969
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...detection systems that have been used by submarines and sub detectors since World War II, and the more advanced electronic navigation devices that have recently come into use aboard high-speed aircraft. Mounted beneath the Alan's hull are four small pairs of sound projectors and receivers. A gyrocompass keeps them constantly aimed toward the cardinal points of the compass as powerful beams of sound are caromed off the ocean floor and picked up again...