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George, you asked:
"I would like to know a bit more than that, if anyone can tell me. What,
roughly is the current limit on the long-term drift of a ring laser gyro,
suitably "dithered"? And how does it differ from that of a fibre-optic
gyro?"

How much do you want to spend? Seriously, both of these can be improved in
many ways but each one costs money. And they're getting better all the time.
Most money seems to be chasing improvements in FOGs instead of RLGs, so I
assume that the engineers feel that the latter have reached a point of
diminishing returns. Good optical gyros have pointing accuracies on the
order of 1 degree per hour. Excellent optical gyros apparently have
accuracies up to a hundred times better. Again, it all depends on what you
want to spend and what you want to accomplish, and there seems to be a lot
of variety in the market.

 -FER

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