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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)