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Glossary
Automatic Terminal Information Service (ATIS):
Recorded information about weather and other conditions at
an airport, periodically updated when conditions change.
Azimuth: The horizontal bearing, as measured clockwise
from true or magnetic north.
Bearing (BRG): The direction to any point, usually
B
measured in degrees relative to true or magnetic north.
Constellation: A group of stars or objects, such as GPS
C
satellites, in the heavens.
Coordinates: Values for latitude and longitude that describe
a geographical point on the surface of the earth.
Course: The planned direction of travel in a horizontal plane.
Course Deviation: A measurement of distance left or right
from the desired course of travel.
Course Deviation Indicator (CDI): A graphic indicator of
course deviation typically shown as a graduated horizontal
bar with an icon indicating the deviation distance left or right
of course.
Common Traffic Advisory Frequency (CTAF)
Database: A collection of data structured in such a way as to
D
allow quick and convenient access to any particular record or
records. The NMC contains a built-in database of waypoints
and waypoint information. Users may add waypoints to this
database.
Degree: 1/360th of a circle.
Departure: The first waypoint in the active route.
Desired Track (DTK): The desired course of navigation
between a point of origin and a destination waypoint.
Destination: The last waypoint in the active route.
Dilution of Precision (DOP): A merit value for the calculated
position based on the geometrical configuration of the satellites
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