Originally Posted by prospector
One should know the error rate of AINS, but it is a variable that cannot be checked until a ground based aid at a known fixed point is interrogated.
So, is this a fair translation:
1) AINS is inherently less trustworthy than ground aids
2) The primary reason is because ground aids are calibrated regularly.
3) Therefore, AINS should not be used a substitute for such ground aids.
I'm just trying to be extra careful here because it is these subtleties upon which many assumptions hinge.