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D Database: A collection of data structured in such a way as
to allow quick and convenient access to any particular
record or records. The Apollo 360 contains a built-in
database of waypoints and waypoint information. Users
may add waypoints to this database.
Degree: 1/360th of a circle.
Desired Track (DTK): The desired course of navigation
between a point of origin and a destination waypoint.
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 altitude above ground.
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.
Glossary of Navigation Terms Apollo 360 GPS Receiver
A-2 P/N 560-0123-01