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Glossary
Tower (TWR): Airport tower communication frequency
UNICOM: The radio frequencies assigned to aeronautical
U
advisory stations for communication with aircraft. Unicoms may
provide such airport information as active runway, wind direction
and velocity and other conditions of importance to pilots.
Universal Coordinated Time (UTC): Greenwich Mean
Time, or the time at the Prime Meridian in Greenwich,
England. Also referred to as Zulu time.
UTC Differential: The difference in time between that at
the present position and UTC.
Universal Transverse Mercator Map Projection System
(UTM): Also known as Military Grid Coordinates, the UTM
grid consists of 60 north-south/east-west zones, each six
degrees wide in longitude.
Very High Frequency Omnirange (VOR): A navigational
V
aid that transmits signals such that a receiver can indicate its
current radial or bearing from the transmitter.
Waypoint: A navigation fix used in area navigation and
W
defined by latitude and longitude coordinates.
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