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GEE was a British radio navigation system used during World War II. It used a series of broadcasters sending out precicely timed signals, and the aircraft using GEE, Bomber Command's heavy bombers, examined the time of arrival on an osciloscope at the navigator's station. If the signal from two stations arrived at the same time, the aircraft must be an equal distance from both, allowing the navigator to draw a line on his map of all the positions at that distance from both stations. By making similar measurements with other stations additional lines can be produced, leading to a fix. GEE was accurate to about 165 yards at short ranges, and up to a mile at longer ranges over Germany.
World War II British electronics
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