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Transport Category
Ask FLYINGHow Do Airliners Navigate the North Atlantic?
Today, inertial reference systems (IRSs) that include laser-ring gyros operate within three separate onboard inertial reference units (IRUs).
Les Abend![](https://www.flyingmag.com/uploads/2023/12/AdobeStock_499603716-scaled.jpeg?auto=webp&auto=webp&optimize=high&quality=70&width=1440)
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