> Indeed. I guess they'd have "re-calibrated" the cart daily whenever
> possible. Sunrise or sunset would have been a good opportunity. So the
> device would have had to work for typical distances of, say, some 100 km:
FWIW modern cars today use the same principal. That's why if you have a car
with GPS (a built-in one, not an aftermarket one) it still knows which way
you are facing when driving around underground (eg parking garage or
tunnel).
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