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Yes I wouldn’t depend on it but it is information. When you get used to seeing many aircraft with your eyes and used to comparing what you see with the reported altitude, you’ll get a feel for whether the information is accurate or inaccurate.

Yes, that's my question. I've been unable to find any information on the web, other than, "It's whatever the aircraft is reporting." Relevant to drones, it seems that the reported altitude from ADS-B apps shouldn't be depended upon (knowing the...

On FlightRadar24 you see the barometric altitude but you don’t know what pressure setting they have.

It is no coincidence that the minimum height a general aviation airplane is supposed to fly over your house is 500’, giving a theoretical buffer of 100’ between you and it if you are at 400’. But you can get a good idea of their height from an...