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NAVSTAR: The name given to GPS satellites
formed from the acronym for NAVigation System
with Time And Ranging.
Non-Directional Beacon (NDB): A low
frequency/medium frequency navigation aid
sending non-directional signals that can be used for
navigation.
O OBS: Omni-Bearing Selector.
P Parallel Track Offset: A course that is parallel to
the designated course, but offset to the right or left
by a given distance.
PDOP:Position Dilution of Precision. See Dilution
of Precision.
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.
RAIM: Receiver Autonomous Integrity
Monitoring. A method of predicting possible
system accuracy errors that may be caused by bad
satellite data. The RAIM algorithm requires that
more satellites are available and usable than
required for a normal GPS position fix.
Range (RNG): The distance from the present
position to a destination waypoint.
S Second: 1/60th of a minute of a degree.
Seed Position:A latitude and longitude position fix
approximately equal to the current position that the
Apollo SL50/60 uses to determine the location of
available satellites from which signals may be
received.
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Glossary of Navigation Terms