Tower (TWR): Airport tower communication frequency
U UNICOM: The radio frequencies assigned to aeronautical
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.
V Very High Frequency Omnirange (VOR): A navigational
aid that transmits signals such that a receiver can indicate its
current radial or bearing from the transmitter.
W Waypoint: A navigation fix used in area navigation and
defined by latitude and longitude coordinates.
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Glossary
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