Desired Track (DTK): The desired course of navigation
between a point of origin and a destination waypoint.
Dilution of Precision (DOP): A merit value for the calculated
position based on the geometrical configuration of the satellites
used; 3 is considered good, greater than 7 is considered poor.
Also called Precision Dilution of Precision or PDOP.
Distance: A measure of interval in space. Also referred to as
range.
Distance Measuring Equipment (DME)
Drift: Displacement from the intended course of travel.
E
Elevation: The angle of a GPS satellite above the horizon.
Estimated Time of Arrival (ETA)
Estimated Time Enroute (ETE)
F
Fix: A geographical location determined by either visual
reference or by electronic navigation aids.
G
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.
Ground (GRND): Ground communication frequency
Ground Speed (GS): Speed of travel across the ground. In
aviation, the relation between ground speed and air speed is
affected by the prevailing winds.
I
Icon: A symbol shown on the display depicting present
position. The icon is shown as a symbol of an airplane on the
Precedus
‘s moving map screens.
Identifier: A name, typically abbreviated, assigned to a
waypoint. The identifier may consist of numbers and alpha
characters, up to six in length. For example, the airport
identifier for Los Angeles International Airport is LAX.
Instrument Flight Rules (IFR)
88
Glossary of Navigation Terms
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