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NVIS - Night Vision.
NVRAM - Non-Volatile RAM; independently power protected
computer memory, see also RAM.
Omega - World-wide radio navigation network.
Omega/VLF - Navigation system; long-range system with very good
long-term accuracy but poor short-term accuracy.
ONC - Operational Navigation Chart.
Glossary
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orthogonal - Mutually perpendicular. The primary aircraft axes are
orthogonally related.
OSS - Omega/VLF Sensor System.
P - Precision.
PAR - Precision Approach Radar.
PCA - Polar Cap Anomaly.
PGS - Pseudo-Glide Slope.
pilotage - Navigation by reference to terrain features, both natural
and man-made, usually with the aid of an appropriate aeronautical
chart.
PLOC - Pseudo Localizer.
PNR - Point of No Return.
polar cap anomaly - In OMEGA/VLF systems, a propagation
anomaly affecting signals traversing polar regions; caused by solar
flares.
PPOS - Present Position
PREV - Previous.
propagation anomalies - Inconsistencies in signal phase or
frequency.
pseudo range - Distance determined by an uncorrected time
measurement.
PT - Procedure Turn.
PVOR - Pseudo-VOR.
Q - Azimuth.
Glossary
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Q - Quality Factor (Q); a measure of a system’s [probable error] in
tenths of a nautical mile. Based on a 95% probability, a Q of 3
would represent a maximum position error of 0.3 nm.
QNE - The barometric pressure used for the standard altimeter
setting (29.92 inches Hg).
QNH - The barometric pressure as reported by a particular station.
q Theta - Azimuth.
r Rho - Distance.
R-Nav - Area Navigation.
RAIM - Receiver Autonomous Integrity Monitoring.
RAM - Computer Random Access Memory; each location (e.g.,
byte) is directly and individually addressable.
rate aiding - The process of correcting LOP’s (lines of position)
taken at different times
REL - Relative (as contrasted to absolute). Mode of navigation for
the Omega/VLF Sensor System.
repeatable accuracy - The ability to return to a previous position,
normally measured in nautical miles.
RFI - Radio Frequency Interference.
rho - Navigational term for distance.
rhumb line - A line which makes the same angle with each meridian
it crosses.
RIS - Radio Interface Simulator; used for testing Universal’s FMS.
ROLL STRG - Roll Steering.
Route - A progression of waypoints, headings, intersections, etc.
that are normal and usual in completing a flight between two points.
Glossary
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RP - Release Point.
RPU - Receiver/Processor Unit.
RRS - Radio Reference Sensor. Provides DME, DME/VOR, and
TACAN navigation capabilities to the FMS.
RSU - Radio Select Unit.
RTU - Radio Tune Unit.
S/W - Software.
SAR - Search And Rescue.
SCN - Software Control Number.
SEP - Spherical Error Probable.
shore line effect - A refraction ground wave caused by the
difference in conductivity between land and water.
skip zone - The gap in radio wave transmission that exists between
the outer limits of ground wave reception.
sky wave - Radiated energy which has been refracted by an ionized
layer of the atmosphere back toward the surface of the earth.
slant range - The straight line distance between the aircraft and the
DME range facility.
slant range error - The difference between slant range and range
over the ground.
SMC - Special Mission Computer. Universal’s Special Missions
Navigation and Flight Management System.
SNR - Signal to Noise Ratio.
SPS - GPS Standard Positioning Service.
Glossary
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SSU - Signal Switching Unit; digital to analog signal converter for
interfacing FMS digital output to conventional analog flight guidance
systems.
Standard Service Volume - Reception limits, expressed in nautical
miles, by altitude, of unrestricted navigational facilities for random
and unpublished (direct) route navigation.
SX - Selected Crosstrack.
SXTK - Selected Crosstrack.
TERPS - Terminal Instrument Procedures.
theta - Navigational term for azimuth.
time bias - An error caused by differences between time standards.
TKE - Track angle Error.
TOD - Top-Of-Descent.
torquing - A process of applying force to a gyro to intentionally
induce precession (drift) so as to correct for the effects of earth
rotation and aircraft movement.
track - The actual flight path of an aircraft over the surface of the
earth.
track angle error - The difference, in degrees and direction right or
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