Above Ground Level (AGL), describes the literal height above the ground over which you’re flying.
Mean Sea Level, or MSL, is your true altitude or elevation. It’s the average height above standard sea level where the atmospheric pressure is measured in order to calibrate altitude.
On a Sectional Chart, all of the numbers you see that denote altitudes are denoted in MSL, unless they are in parentheses. If you see a number in parentheses, that denotes AGL.
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