magnetic declination
True-north compass offset
Magnetic declination is the angle between magnetic north (where a compass needle points) and true north (the direction to the geographic North Pole).
This angle varies by location and shifts over time as Earth's magnetic field changes.
Navigators must account for declination when using a compass to plot courses: The magnetic declination here is 12 degrees east.
Pointed implement for sewing
- true northDirection to the pole
- bearingPosture or orientation
- azimuthHorizontal directional angle
- deviationDeparture from expected path
correction · calibration · adjustment · polarity · magnetometer · compass rose · heading · dial
Having equal angles
- secular variationLong-term magnetic field shift
- geomagnetismEarth's magnetic field
- paleomagnetismRemnant magnetism in rocks
- magnetosphereCelestial body's protective field
dipole · flux · inclination · intensity
Flattening Earth for charts
- meridianPole-to-pole great circle
- grid northDirection maps call up
- topographicConcerning surface feature arrangement
- surveySystematic data collection
geodetic · coordinate system · UTM · legend · orienteering · field map · USGS · contour
Data shown visually
- pilotingControlling a vehicle's course
- dead reckoningPosition-tracking via estimated motion
- course correctionMid-journey directional fix
- nauticalOf ships and sailing
maritime · seafaring · sextant · celestial navigation · waypoint · plotting · flight planning · aviation
needle
Pointed implement for sewing
- true northDirection to the pole
- bearingPosture or orientation
- azimuthHorizontal directional angle
deviation · correction · calibration · adjustment · polarity · magnetometer · compass rose · heading · dial · mariner's compass
isogonic
Having equal angles
- secular variationLong-term magnetic field shift
- geomagnetismEarth's magnetic field
- paleomagnetismRemnant magnetism in rocks
magnetosphere · dipole · flux · inclination · intensity
map projection
Flattening Earth for charts
- meridianPole-to-pole great circle
- grid northDirection maps call up
- topographicConcerning surface feature arrangement
survey · geodetic · coordinate system · UTM · legend · orienteering · field map · USGS · contour · datum
chart
Data shown visually
- pilotingControlling a vehicle's course
- dead reckoningPosition-tracking via estimated motion
- course correctionMid-journey directional fix
nautical · maritime · seafaring · sextant · celestial navigation · waypoint · plotting · flight planning · aviation · approach
- cartographymaps, world map, atlas, globes, cartographers
- mapmakingcartographer, map scales, mapmaker, map projection, compass rose
- surveyingsurveyor, theodolite, land surveys, survey markers, triangulation
- polar magnetismmagnetometers, compass readings, magnetosphere
- topo mapscontour lines, contours, scale bar, benchmarks, topo maps
- navigationcompass, compass rose, signs, charts, navbar
magnet, magnetic, magnetism, magnets, magnetize, magnetized, declination, magnetizes, magneto