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Glossary of Navigation Terms
A Altitude (GPS ALT): Altitude, as calculated by the
Apollo SL50/60, 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.
Almanac: Data transmitted by a GPS satellite
including orbit information on all satellites, clock
correction, and atmospheric delays.
Automatic Terminal Information Service
(ATIS): Recorded information about weather and
other conditions at an airport, periodically updated
when conditions change.
Autonav: The function that allows you to set the
SL50/60 to scroll automatically through selected
navigation displays .
Azimuth: an arc, 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 Circular Error Probable (CEP): As applied to
GPS position fix accuracy, the radius of a circle
inside of which there exists a 50 percent chance of
being located.
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 between
the departure and destination waypoints.
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Glossary of Navigation Terms