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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 Apollo SL50/60
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 used; 3 is considered
good, greater than 7 is considered poor. Also called
Position Dilution of Precision or PDOP.
Direct-To: The function or procedure that directs
you from your present position to the designated
TO, or destination, waypoint.
Distance: A measure of interval in space. Also
referred to as range.
DME - Distance Measuring Equipment
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Glossary of Navigation Terms