(See FLIGHT LEVEL.)
a. MSL Altitude- Altitude expressed in feet measured from mean sea level.
b. AGL Altitude- Altitude expressed in feet measured above ground level.
c. Indicated Altitude- The altitude as shown by an altimeter. On a pressure or barometric altimeter it is altitude as shown uncorrected for instrument error and uncompensated for variation from standard atmospheric conditions.
(See ICAO term ALTITUDE.)
ALTITUDE [ICAO]- The vertical distance of a level, a point or an object considered as a point, measured from mean sea level (MSL).