PSX.NET.vPilot

[macroflight]

I can't be sure, but I imagine something like this

[Gary Oliver]

What was the final trick?

In summary ignore the Altitude Above MSL values from vPilot as they seem to be completely random!

We now use Pressure Altitude (Calibrated to STD Pressure) values from vPilot.  Then apply a pressure altitude correction based on OAT, QNH, Altitude up to 18,000 then apply the simplified none temp corrected formula from 18,000 and above (27ft per ft) and inject the traffic in to PSX.

This then works with the OAT affects Altimeter setting in PSX which MSFS and x-plane aircraft all use too.

I have confirmed that TCAS, Traffic out the window, VATSIM radar altitudes and our altitude on other peoples TCAS all matches now from ground to FL410.

Finally!

Cheers
G