Glossary Of Navigation Terms - II Morrow Inc. Precedus User Manual

Glossary of Navigation Terms

A
Altitude (GPS ALT): Altitude, as calculated by the
Precedus, based upon a mathematical model of the earth's
surface curvature. A substantial difference between this
altitude value and altitude referenced to sea level may exist.
Automatic Terminal Information Service (ATIS):
Recorded information about weather and other conditions at
an airport, periodically updated when conditions change.
Azimuth: Bearing, as measured clockwise from true or
magnetic north.
B
Bearing (BRG): The direction to any point, usually
measured in degrees relative to true or magnetic north.
C
Constellation: A group of stars or objects, such as GPS
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)
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 Precedus contains a built-in database of
waypoints and waypoint information. Users may add
waypoints to this database.
Degree: 1/360th of a circle.