Apollo 360 Map Display | Glossary of Navigation Terms |
Instrument Flight Rules (IFR)
Intersection (INT): A point defined by any combination of courses, radials, or bearings of two or more navigational aids.
KKnot (kt): A unit of speed equal to one nautical mile per hour.
LLatitude (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 the north to the south pole, measured in degrees, minutes, and seconds of a circle, east or west of the Prime Meridian (Greenwich, England).
MMagnetic 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 local magnetic disturbances. It is shown on 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 to 39.37 inches.
Minute: 1/60th of a degree.
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