AMC1 ATM/ANS.OR.A.090(b) Common reference systems for air
navigation
ED Decision 2020/008/R
VERTICAL REFERENCE SYSTEM
(a) A service provider should use the Earth Gravitational Model — 1996 (EGM-96), as the global gravity model.
(b) When a geoid model other than the EGM-96 model is used, a description of the model used, including the parameters required for height transformation between the model and EGM-96, should be provided in the aeronautical information publication (AIP).
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