GM1 Article 8(2)(c) Network identification
service
ED Decision 2022/022/R
Due to the fact that the altitude above mean sea level (AMSL) calculated from the measured value of the barometric sensor and the QNH, cannot be compared to the calculated value of the altitude AMSL using the GNSS systems, it is recommended to exchange the altitude values in relation to the WGS 84 ellipsoid between U-space systems.
Wherever the flight altitude above sea level is required to be determined with the use of GNSS systems, it is recommended to use the EGM2008 or at least the EGM96 geoid models as the definition of mean sea level, as agreed with the competent authority.
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