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Operator's Manual
GEOGRAPHIC COORDINATES
Glossary
204
Angular displacements along parallels oflatitude and meridians of
longitude on an ellipsoidal surface. Ellipsoidal coordinates.
GEOID
The Earth'ssurface with 'alI-topographical undulations removed
(equipotential surface) so that all points on the surface approxi-
mate mean sea level.
GEOIDAL HEIGl-IT
Deviations of the geoid above and below the ellipsoid due to non-
uniformity ofthe Earth's mass. Geoidal height is positive when the
deviation is outward from the central volume of the ellipsoid, and
negative when it is inward.
GDOP (Geometric Dilution of Precision)
An indicator of the accuracy in position (latitude, longitude, alti-
tude, and time). See DILUTION OF PRECISION.
GFSK
Gaussian-Filtered-Shift-Keying - A standardized method of
modulating digital data prior to transmission on a data link.
GMSK
Gaussian-Minimum-Shift-Keying - GFSK using BT-products and
modulation index which optimizes the modulated signal.
GNSS
Global Navigation Satellite System - A common label for satellite
navigation systems (such as GPS and GLONASS).
GLOBAL POSmONING SYSTEM (GPS)
The NAVSTAR Global Positioning System, which consists of or-
biting satellites, a network of ground control stations, and user
positioning and navigation equipment. The system has 24 satel-
lites plus 3 active spare satellites in six orbital planes about 20,200
kilometers above the earth.
GLONASS
A satellite navigation system developed and operated by
Russia.
Version 1.5
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