ATM/ANS.OR.A.090 Common reference
systems for air navigation
Commission Implementing Regulation (EU)
2020/469
For the purpose of air navigation, service providers shall use:
(a) the World Geodetic System – 1984 (WGS-84) as the horizontal reference system;
(b) the mean sea level (MSL) datum as the vertical reference system;
(c) the Gregorian calendar and coordinated universal time (UTC) as the temporal reference systems.
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