LPV vs LNAV/VNAV?

Andrew Sarangan wrote:

Sam Spade wrote:

paul kgyy wrote:


Both of these options require a WAAS receiver, I presume?


Yes, and if WAAS is not available to the standards required by the specs
then the 146 box will not accept the WAAS solution, which means (using
Garmin as an example) LPV, L/VNAV, and LNAV+V will not be available;
only LNAV will be available.


Something I never understood is why LNAV approaches don't automatically
show a glideslope so that the airplane arrives at the MDA at the VDP.


With the 146 spec you will often have an advisory glideslope to MDA.
That is the LNAV+V mode and will be provided if Jeppesen has coded that
capability into the approach's database string. As Garmin says in the W
handbood, not all LNAV-only IAPs have been so coded.

test

"paul kgyy" wrote in message
ups.com...
Can someone explain to me the difference between these two approach
types, and how they relate to WAAS?

A sample approach that has both is KARR RNAV(GPS) RWY 9. LPV DA is
956, LNAV/VNAV DA is 990.