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.
NAVSTAR:
The name given to GPS satellites formed
from the acronym for
NAV
igation
S
ystem with
T
ime
And
R
anging.
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: R
eceiver
A
utonomous
I
ntegrity
M
onitoring. 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.
15-8
Glossary
Summary of Contents for 50
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