What is the datum for levels broadcasted by ADS?
Is it tied to the specific aircraft's altimeter setting? or a standard datum?
Edit: Thinking to myself later ... silly question, of course its encoding from the aircraft's altimeter. But isn't that just as accurate as asking the pilot what his altitude his ... as he reads it off his altimeter ?
Therefore, if you believe the pilot ... why can't you believe the ADS broadcast? ... or am I missing something here.