Glossary

Glossary

AAltitude (GPS ALT): Altitude, as calculated by the Apollo GX, 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.

Altitude Assist: An aid that provides guidance in descending from one altitude to another. See the Altitude Assist description on page 14 for details.

Almanac: Data transmitted by a GPS satellite including orbit information on all satellites, clock correction, and atmospheric delays.

ARC: A DME arc terminator with the preceding flight plan leg is described as an arc to this waypoint. An ARC waypoint may follow another ARC waypoint.

ATC Ring: On the map display, an artificial ring five nm in diameter is drawn around airports that have a control tower.

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 GX to scroll automatically through selected navigation displays .

Azimuth: an arc, as measured clockwise from true or magnetic north.

BBaro Altitude: Barometric altitude (pressure altitude corrected for local altimeter setting). This altitude should match the altitude displayed on your aircraft altimeter.

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