SR-71

Big John writes:

Although the pilot takes off and lands the airplane manually, the
navigation system is accurate enough to put the airplane on the runway
in zero-zero conditions after flying nonstop from Californiato Iraqand
return with four inflight refuelings.

I'm not so sure about that. The ANS was accurate to within half a mile or so,
as I recall. It wasn't good enough for a landing in zero visibility. Of
course, the published accuracy for the ANS could be (dramatically)
understated.