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Re:Giant Ship Is Moved To and Fro to Break Suction: Suez Update by walrus01 on Monday March 29, 2021 @01:54AM (#26618106)
same general concept as antenna alignment tools used by tower climbing contractors. It has both magnetic compasses and several GPS receivers in it.

https://www.viavisolutions.com/en-us/products/3z-rf-vision

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