Mean Sea Level (MSL)
Mean Sea Level (MSL) is the average height of the sea surface at a particular location over a period of time. In aviation, MSL is used as a reference point for altitude measurement. Altitude is the vertical distance of an aircraft above MSL. This is important for flight planning, navigation, and communication with air traffic control. MSL is typically measured by tide gauges and satellite altimetry. It is important to note that MSL is not a fixed height and can vary due to factors such as tides, currents, and weather conditions.
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