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WGS 84 (that spelling) is the name of an ellipsoid (EPSG::7030), the name of a geodetic coordinate reference system (EPSG::4326), and the alias of a datum (EPSG::6326), official name World Geodetic System 1984. WGS84 (no space) is the alias of the ellipsoid (EPSG::7030). WGS 84 is most commonly used to describe the coordinate reference system.
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Relation between Geoidal separation and antenna altitude in GGA sentence?
Looking at NMEA Revealed,
We have for description of the field altitude:
Antenna Altitude above/below mean-sea-level (geoid) (in meters)
And for description of the field geoidal separation:
…