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Section G - Glossary of Terms Used in this Guide
ALT (GPS Altitude): Altitude, as calculated by the
GPS receiver, 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.
ATIS (Automatic Terminal Information Service):
Recorded information about weather and other
conditions at an airport, periodically updated when
conditions change.
ARSA: Airport Radar Service Area
Azimuth: Bearing, as measured clockwise from true or
magnetic north.
BRG (Bearing): The direction to any point, usually
measured in 360 degrees relative to true or magnetic
north.
Constellation: A group of fixed stars or objects, such as
GPS satellites, in the heavens.
Coordinates: Latitudes and longitudes determining a
given geographical point on the surface of the earth.
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