ADSB altitude read out on flight aware vs other planes in same area

[jethound]

I have noticed that my Altitde readout is consistently 2 hundred low on the ADSB tracks on FlightAware Verses what I am flying with a current altimeter setting.
transponder and altimeter checks are current for IFR. As well as the ADSB
Been to two different shops over the last 4 years for those checks and notice error is always there.
any ideas.
Thanks
Jack Hunt

 

[Marc_J._Zeitlin]

I have noticed that my Altitde readout is consistently 2 hundred low on the ADSB tracks on FlightAware Verses what I am flying with a current altimeter setting.

ADS-B is based on the transponder altitude, which is PA. Your altimeter setting is whatever the barometric pressure is. There will always be a difference unless the barometric setting is 29.92.

 

[jethound]

Thanks for the response.