Filter
Top Products
Selective Availability (SA): The degradation of accuracy
of GPS position fix data by the United States Department
of Defense for civilian use.
Statute Mile: A distance measurement equal to 5,280 feet
or 0.87 of a nautical mile.
T Three-dimensional (3D) Position Fix: A position fix
defined by latitude, longitude, and altitude.
Track (TRK): The imaginary line that the flight path of
an airplane makes over the earth.
True North: Geographic north, at the earth’s north pole.
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.
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 navigational fix used in area navigation and
defined by latitude and longitude coordinates.
Apollo 360 GPS Receiver Glossary of Navigation Terms
P/N 560-0123-01 A-5