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A comment on Back-ups for GPS: Satellite-navigation systems at risk of jamming. Parent comment
* https://www.davisinstruments.com/product/artificial-horizon/
* https://www.starpath.com/catalog/accessories/1840h.htm
* https://www.celestaire.com/product/davis-artificial-horizon/
They've been around since (at least) 1907:
* https://www.scientificamerican.com/article/an-artificial-hor...
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* https://www.davisinstruments.com/product/artificial-horizon/
* https://www.starpath.com/catalog/accessories/1840h.htm
* https://www.celestaire.com/product/davis-artificial-horizon/
They've been around since (at least) 1907:
* https://www.scientificamerican.com/article/an-artificial-hor...