Responding to a question at a conference in 1964 on, it was noted in the 1920s, can achieve accuracy, "ten to fifteen minutes of arc" of. To the 1950s, it can achieve "one minute" accuracy. By 1964, it claimed the 20 baseline survey average error of 4 seconds, and noted that it is believed that within a few years "every time" can be achieved, "perhaps one second," the consistent accuracy. Although it was predicted that by the year 2000 will be the widespread use of low-temperature inertial navigation system based on nuclear magnetic resonance gyro, but since 1960, gyroscope annex almost no further internal improvements. After 1960, most of the developments in the field have been measured by a gyroscope that various modifications enable the observer to perform more accurate and repeatable investigation. The latest research on the application of magnetic levitation and fiber optic gyroscope has registered a number of patents, so the least developed two "gyroscope" station.
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