II Morrow Inc. 920 GPS - Manual (Page 95)

UTC (Universal Coordinated Time): 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.
VOR (Very High Frequency Omnirange): A
navigational aid which transmits signals such that a
receiver can indicate its current radial or bearing from
the transmitter.
Waypoint: A navigational fix used in area navigation
and defined by latitude and longitude coordinates.
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