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As I understand it with LR gyros, if you rotate them sufficiently slowly so that they move less than half a wavelength in the time the light transits, they re-lock on the new orientation without interference. This is a limit based on quantum physics and it's why I said that larger gyros might reduce the problem.

Well, if so I think this is an issue that designers of military systems have been well aware of for years. Drones don't seem any more at risk than submarines, which have used INSs successfully for decades. Drones seems much less likely to go through large stretches of time without access to GPS than submarines, so I'd be surprised if it's an issue.

I think the real problem is that INSs are simply to bulky and heavy for drones, rather than anything to do with drift.

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