Originally Posted by
Seloco
If the altitude readings are anywhere near correct then a number of Sussex and Kentish folk are going to have had a rude early morning awakening last night. I'm almost jealous I wasn't one of them!
SE UK QNH yesterday evening was around 1024, so you would need to add about 300' to ADS-B altitudes to get a true height AMSL (and then subtract your elevation to get AGL).
But still pretty low.
