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Glossary of Terms Appendix H
SUPERSTAR II User Manual Rev 3 79
Variable field - by NMEA standards, a data field which may or may not contain a decimal point and which
may vary in precision following the decimal point depending on the requirements and the accuracy of the
measuring device.
WGS-84 - World Geodetic System 1984 is an ellipsoid designed to fit the shape of the entire Earth as well as
possible with a single ellipsoid. It is often used as a reference on a worldwide basis, while other ellipsoids are
used locally to provide a better fit to the Earth in a local region. GPS uses the center of the WGS-84 ellipsoid as
the center of the GPS ECEF reference frame.