Alphacenturi, fascinating. You state
“The CAAP makes not mention of it because it is untrue.”
Let’s look at the approach plate for Goulburn RNAV-Z (GNSS) RWY 04.
How does the LNAV+V know when to advise with the glideslope indicator to leave 4,700 feet? Presumably it has a GPS position to start, or it could interpolate back at 3 degrees from the 4,510 feet at the 7 mile distance from the missed approach waypoint to 4,700 feet. This still means it is operating from a GPS position to start the descent.
Are you saying this is not what happens? What do you believe happens, and why wouldn’t it happen in the way that I have explained?
I point out whether the LNAV+V descent starts at an actual GPS position, or is interpolated back from another GPS position, it has exactly the same result – that is, a dramatic improvement in safety.