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Instrument Flight Rules (IFR)
Intersection (INT): A point defined by any combination
of courses, radials,or bearings of two or more navigational
aids.
K
Knot (kt): A unit of speed equal to one nautical mile per
hour.
L
Latitude (lat): Any line circling the earth parallel to the
equator, measured in degrees, minutes, and seconds north
and south of the equator.
Longitude(lon):Any line from thenorthtothesouthpole,
measured in degrees, minutes, and seconds of a circle, east
or west of the Prime Meridian (Greenwich, England).
M
Magnetic North: The region, some distance from the
geographic north pole where the earth’s magnetic lines
concentrate. A magnetic compass points to the magnetic
north.
Magnetic Variation (Mag Var): The angle between the
magnetic and true north. At various points on the earth it is
different due to localmagnetic disturbances. It is shownon
charts as isogonic lines marked with degrees of variation,
either east or west. These degrees must be added to or
subtracted from the true course to get the magnetic course.
(Easterly variations are deducted, and westerly variations
are added.)
Map Datum: A mathematical model of the earth used for
the purpose of creating navigation charts and maps.
Meter (m): A metric distance measurement equal to39.37
inches.
Minute: 1/60th of a degree.
P/N 560-0119-00 A-3
Apollo 360 Map Display Glossary of Navigation Terms