Aviation abbreviation
Above Mean Sea Level
At a glance
Meaning of Above Mean Sea Level
Altitude or elevation referenced to mean sea level.
More about Above Mean Sea Level
AMSL identifies the vertical reference used for a height value. It differs from AGL, which refers to the ground at a location.
The distinction matters when comparing terrain, aerodrome elevations and aircraft altitude. Values should not be combined without checking that their references and units agree.