Division ATM/ANS.OR.A.090 Common reference systems for air navigationF1

For the purpose of air navigation, service providers shall use:

1. (a)

   the World Geodetic System – 1984 (WGS-84) as the horizontal reference system;

2. (b)

   the mean sea level (MSL) datum as the vertical reference system;

3. (c)

   the Gregorian calendar and coordinated universal time (UTC) as the temporal reference systems.