GDOP (Geometric Dilution of Precision)
An indicator of the accuracy in position (latitude, longi-
tude, altitude, 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 POSITIONING SYSTEM (GPS)
The NAVSTAR Global Positioning System, which consists
of orbiting satellites, a network of ground control sta-
tions, and user positioning and navigation equipment.
The system has 24 satellites 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.
GMT
Greenwich Mean Time. See also UNIVERSAL TIME
COORDINATED.
GPS LOG
A feature of the navigator that measures the sailed
distance based on the GPS signals rather than a water
distance sensor.
GPS SYSTEM TIME
Time corrected to Universal Time Coordinated (UTC) and
used as the time standard by the user segment of the
GPS system.
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