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magnetic variation to 0 degrees at positions above 70
degrees north or south latitude.
Map Datum: A mathematical model of the earth used for
the purpose of creating navigation charts and maps. The
Apollo 360 contains the set of datums listed in
Appendix B.
Meter (m): A metric distance measurement equal to 39.37
inches.
Minute: 1/60th of a degree.
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.
Non-directional Beacon (NDB): Alow
frequency/medium frequency navigation aid sending
non-directional signals that can be used for navigation.
P Position Dilutionof Precision (PDOP): Amerit valuefor
the calculated position based on the geometrical
configuration of the satellites used; 3 is considered good,
greater than 7 is considered poor.
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.
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
360 uses to determine the location of available satellites
from which signals may be received.
Glossary of Navigation Terms Apollo 360 GPS Receiver
A-4 P/N 560-0123-01