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1

Those who are saying 'everything in aviation is referenced only to the altimeter' are oversimplifying the situation today with GNSS based instrument approaches providing vertical guidance. A barometric altitude will be used to determine the point at which the pilot must go-around if runway environment isn't visible, but the glideslope that the aircraft ...


2

That is not correct. There are three different altitude systems: True altitude is the height above Mean Sea Level (MSL). This is what you get when you set your altimeter to QNH. Using this, your altimeter should read 200ft when you are on the runway if the airport elevation is listed as 200ft MSL. Absolute altitude is the height Above Ground Level (AGL). ...


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