It's has to orient itself in 3d space somehow. Wikipedia says the best you can get with dead reckoning drifts by .6nm/hr. I'm guessing that can be useful in som

It's has to orient itself in 3d space somehow. Wikipedia says the best you can get with dead reckoning drifts by .6nm/hr. I'm guessing that can be useful in some cases, but it probably limits a lot.