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True altitude is the elevation above Mean sea level.

Also referred to feet/metres Above Ground Level (AGL). Absolute altitude is the height of the aircraft above the terrain over which it is flying.Indicated altitude is the reading on the altimeter.There are several types of aviation altitude: On the flight deck, the definitive instrument for measuring altitude is the pressure altimeter, which is an aneroid barometer with a front face indicating distance (feet or meters) instead of atmospheric pressure. When flying at a Flight Level, the altimeter is always set to standard pressure (29.92 / 1013.25). Pressure altitude divided by 100 feet is referred to as the flight level, and is used above the transition altitude (18,000 feet in the US, but may be as low as 3,000 feet in other jurisdictions) so when the altimeter reads 18,000 ft on the standard pressure setting the aircraft is said to be at "Flight level 180". With the exception of a few countries whose aviation authorities use metres (e.g.

Air NavigationĪviation altitude is measured using either Mean Sea Level (MSL) or local ground level (Above Ground Level, or AGL) as the reference datum. Parties exchanging altitude information must be clear which definition is being used. "true altitude"), or implicitly through the context of the communication. In aviation, the term altitude can have several meanings, and is always qualified by either explicitly adding a modifier (e.g.