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Original Message Very sad day for HEMS crews all around and our thoughts and prayers are with the friends and families of the crew that was lost. FlightAware FAQ regarding altitudes: Are displayed flight altitudes AGL (above ground level) or MSL (mean sea level)? SHARE | BACK TO TOP
Displayed altitudes are dependent on the data source for the position data. FlightAware receives many different types of altitude data, including uncorrected pressure altitude, corrected pressure altitude, flight levels, GPS-based height above mean sea level (MSL) and GPS-based height above ellipsoid. Data received from the FAA or other air navigation service providers is typically MSL. ADS-B data is frequently height above ellipsoid but there are exceptions. In general, it is best to assume altitudes are uncorrected pressure altitudes (a variation of MSL). FlightAware does not display AGL altitudes.
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