I’ve been using Navigraph’s data for MSFS2020 for a while now and I’ve noticed an issue with almost all of the ILS approaches. The G/S vertical alignment is, in 90% of cases off - which causes the in-game TCH to be wrong (usually high).
Some examples; EGSS, EGGW
In EGGW for example, you have to deliberately deviate below the glideslope, almost reaching a 2-dot low indication in order to remain on a 3deg slope terminating at the aiming markers. If performing a CAT III approach, the aircraft will end up flaring and touching down just beyond the TDZ and far outside of the normal autoland limits.
Is this an issue with the elevation data in the scenery or is it related to G/S antenna placement??