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# Frequently Asked Questions (under construction\!)
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## GPS Time Transfer
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### How do you know the GPS receivers in Gran Sasso and CERN are not introducing any systematic error?
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### Have you taken the antenna cable delay into account?
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### Does this system suffer from any kind of Sagnac effect, related to the rotation of the Earth?
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## Fiber length calibration
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### Why haven't you used fiber reflectometry to measure fiber lengths?
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### These fibers are not length-compensated online. What is the length change throughout the year?
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## Beam Current Transformer cable calibration
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### You have calibrated using an LHC beam. How do those measurements apply to the CNGS beam?
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