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N
Nautical Mile (nm): A distance measurement equal to
6,076 feet, or 1.15 statute mile. One nautical mile is also
equal to one minute of latitude.
Non-directional Beacon (NDB): A low
frequency/medium frequency navigation aid sending
non-directional signals that can be used for navigation.
P
Position Dilution ofPrecision(PDOP): A merit value for
the calculated position based on the geometrical
configuration of the satellites used; 3 is considered good,
greater than 7 is considered poor.
R
Radial: Any of the 360 magnetic courses from a VOR or
similar navigational aid, beginning at the navigational aid
and proceeding outward in a straight line.
Range (RNG):The distance from the present position to a
destination waypoint.
S
Second: 1/60th of a minute of a degree.
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 linethatthe 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 toaeronautical
advisory stations for communication with aircraft.
A-4 P/N 560-0119-00
Glossary of Navigation Terms Apollo 360 Map Display