Glossary

NAVIGATION - the art of determining the geographical position and maintaining desired direction of an aircraft relative to the earth’s surface.

BEARING - the direction from an airplane to a ground station.

DRIFT ANGLE - an angle computed by subtracting the airplane heading from the airplane track.

BEACON - a device which emits a signal for use as а guidance or warning aid.

AUTOMATIC DIRECTION FINDER - a system which determines the direction of a radio station.

NON DIRECTIONAL BEACON - a radio beacon which transmits non-directional signals whereby the pilot саn use the ADF to determine his bearing to or from the station.

VHF OMNI-DIRECTIONAL RANGE - a navigational system which tells the airplane’s bearing from a VOR ground station and its deviation from a selected course to/from the station.

DISTANCE MEASURING EQUIPMENT - a radio navigational aid for determining the distance from a selected DME ground station by measuring the time of transmission to and from it.

INERTIAL REFERENCE SYSTEM - a self-contained navigational system based оп the measurement of acceleration and attitude.

GLOBAL POSITIONING SYSTEM – a long-range navigation system that takes navigation input from transmissions generated bу а series of satellites in synchronous orbit.

INSTRUMENT LANDING SYSTEM – a precision instrument approach system which normally consists of the following airplane components: localizer receiver, glide slope receiver, and marker beacon receiver.

MODULATION, Combining two оr more electrical signals with the result that оnе signal is varied bу the others.

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