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Glossary
used; 3 is considered good, greater than 7 is considered poor.
Also called Position Dilution of Precision or PDOP.
Distance: A measure of interval in space. Also referred to as range.
DME: Distance Measuring Equipment
Drift: Displacement from the intended course of travel.
Elevation: The angle of a GPS satellite above the horizon.
E
Height above mean sea level.
En Route EPE: Loran EPE limit of 2.8 nm.
Enroute Mode: The phase of flight when more than 30 nm
from departure or destination airport. During en route mode,
full scale deflection is at or transitioning to 5.0 nm.
Enroute RAIM Integrity: 2.0 nm RAIM alarm limit.
EPE: Estimated Precision Error.
Ephemeris: A list of accurate positions or locations of a
celestial object as a function of time.
Estimated Time of Arrival (ETA)
Estimated Time Enroute (ETE)
FAF: Final Approach Fix.
F
Fix: A geographical location determined by either visual
reference or by electronic navigation aids.
GDOP: Geometric Dilution of Precision. The relationship
G
between errors in receiver position and time and in satellite
range.
Global Positioning System (GPS): Also known as
NAVSTAR. A constellation of satellites launched by the U.S.
Department of Defense into six orbit lanes (four satellites per
plane) at an altitude of 10,898 nm above the earth.
Greenwich Mean Time (GMT): See Universal Time
Coordinate (UTC).
Ground (GRND): Ground communication frequency
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