Hi Pete,
Thank you for the comments! In regards to the above, let me share my observations also, putting aside SmartCars or whatever other third party software.
I had requested an experiment and visualized the debug of P3D and FSUIPC logging for offset 030C. Vertical speed, which comes from the SIM is all the time having a constant difference of app. 200 fpm compared to the one, which comes from 030C (the values of 030C are higher than those of the SIM). Moreover, the PFD of the bus is showing the one, which comes from the SIM.
There is something, which comes into my mind after reading your reply stating that offset 030C, is making a copy of offset 02C8 continuously whilst in the air. Please correct me, if I am wrong, but the format of 02C8 is 256*mps. Right? Is there a chance for some wrong conversion to fpm (feet per minute) which the format of 030C is?
Thank you!