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.
PRN: GPS satellite Pseudo-Random Numbers are
used to uniquely identify satellites. This is different
than the SVN (Space Vehicle Number, or satellite
serial number). When excluding satellites from the
RAIM Prediction , use the PRN number found on the
NOTAMs and NANUs, not the SVN.
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: The distance from the present position to a
destination waypoint.
RW: Runway Fix. A code appended to a waypoint in
the database that may not appear on a published map.
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Glossary
Summary of Contents for Apollo GX 50
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