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
112
Glossary of Navigation Terms
Summary of Contents for Apollo SL50
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