Originally Posted by
EvilMonkey
The E-170/175/190/195 has the capability to do VGP approaches. On the E-Jets, it works much like an ILS only the needles are magenta instead of green. The sensitivity remains constant, unlike an ILS, so the course and glideslope don't get squirrelly close to the ground. We (S5) can shoot these approaches using LNAV/VNAV minimums on any compatible RNAV approach.
EvilMonkey -
If I understand it right - there is nothing to get squirrelly. It is a math problem whereas an ILS is an electronic signal in space most likely bounced off the ground and susceptible to all sorts of irregularities - - correct?
USMCFLYR
You got it. The "needle" sensitivity remains at a mathematical fixed sensitivity, 0.3 RNP, both for the lateral guidance and glidepath.