It's also being used in aerospace & naval navigation. Interestingly, the more advanced systems use fibre-optic gyroscopes, see https://en.wikipedia.org/wiki/Fib

It's also being used in aerospace & naval navigation. Interestingly, the more advanced systems use fibre-optic gyroscopes, see https://en.wikipedia.org/wiki/Fibre-optic_gyroscope https://en.wikipedia.org/wiki/Fibre-optic_gyroscope. Northtrop Grumman manufactures those, for example.