As per the title: I just did a flight with the C172 G1000 and noticed that the Ground Speed in the MFD does not equal the True Airspeed plus the appropriate wind vector component in the PFD. Screenshot:
In the screenshot, the TAS is 111kts, the tailwind component is less than 2kts but the ground speed is 116kts. Not a huge difference but I cannot say I have ever noticed this discrepancy before. LNM a short while earlier shows more realistic delta between TAS and GS:
I’ve also noticed the discrepancies between TAS, headwind/tailwind component and output GS. I have a bug report about it here.
One question for you - was the altimeter actually 29.92? S59, is 29.62 right now. That would make your actual altitude 7200’. But a pressure altitude of 7500 and temp of 6°C is 111 kts TAS, so that part is correct.
Yes, I was using a clear weather preset as the live weather was pretty awful. I am generally a low and slow GA flyer to enjoy the scenery. And the scenery was beautiful FWIW.
I have run into this as well but it has a simple explanation. TAS on the gps is calculated from the indicated airspeed, but the TAS on the outside view HUD or in the simvars are calculated from the calibrated airspeed (and that is the actual real speed).
You can check with dev mode:
