Garmin Apollo GX 50 User Manual page 322

Glossary
N
O
P
R
15-8
MSA: Minimum Safe Altitude. The elevation of the
highest obstruction near the aircraft plus a 1,000 or
2,000 foot
non-mountainous terrain, a 1,000 foot buffer is added.
In mountainous terrain, a 2,000 foot buffer is added.
The result is rounded to the nearest 100 feet.
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 NAVigation System with Time
And Ranging.
Non-Directional
frequency/medium frequency navigation aid sending
non-directional signals that can be used for
navigation.
OBS: Omni-Bearing Selector.
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.
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.
buffer added
Beacon
for safety.
(NDB): A
In
low