
	Where results make sense

Topic: Magnetic declination

Related Topics

Magnetic north

North

North Pole

South Pole

National Geophysical Data Center

Gravity

Earth

Biological dispersal

Red hair

PRINCE2

Beech

Charles XII

Charles XII of Sweden

PMMP

Sodium

	Magnetic declination - Wikipedia, the free encyclopedia
		The magnetic declination (or magnetic variation) at any point on the earth is a property of the geomagnetic field defined as the angle that must be added or subtracted in converting between two kinds of directional information:
		A prediction of the current magnetic declination for a given location (based on a world-wide empirical model of the deep flows described above) can also be obtained on-line from a web page operated by the National Geophysical Data Center, a division of the National Oceanic and Atmospheric Administration of the United States.
		Magnetic variation is the difference between True Bearings and Magnetic Bearings and is caused by the different locations of the Geographic North Pole and the Magnetic North Pole plus any local anomalies like iron deposits.
	en.wikipedia.org /wiki/Magnetic_declination (1228 words)

	Magnetic deviation - Wikipedia, the free encyclopedia
		Magnetic deviation is the error induced in a compass by local magnetic fields, which must be allowed for, along with magnetic declination, if accurate bearings are to be calculated.
		In nautical terminology deviation is the error caused by the metal parts of the ship, an error dependent on the magnetic heading (the angle the ship makes to magnetic north) whereas variation is the difference between true north and direction of the earth's magnetic field at that point without the ship.
		The later sources of magnetic deviation vary according to location, and also vary over time (conditions in the earth's crust/mantle change over time.) Generally, they are indicated on maps, so you must take into account the deviation for your current location.
	en.wikipedia.org /wiki/Magnetic_deviation (334 words)

	SCO Web: Magnetic Declination (Site not responding. Last check: 2007-11-04)
		The angular difference between the geographic and the magnetic meridians at a point on the earth is called magnetic declination.
		The values for magnetic declination in Wisconsin vary today from -4.0° in Door County to +1.5° in the west-central part of the state.
		This causes "drift" of magnetic north and oscillations of the magnetic meridian.
	www.geography.wisc.edu /sco/maps/magneticdeclination.php (898 words)

	Geomagnetism - Magnetic declination
		Magnetic declination also undergoes changes that are much more rapid than secular variation and are a result of magnetic activity.
		Declination is defined as the angle between magnetic north and the true north.
		Declination is also shown on aeronautical charts as contour lines and on hydrographic (marine) charts either as contour lines or in the form of a compass rose, depending on the scale of the chart.
	gsc.nrcan.gc.ca /geomag/field/magdec_e.php (1110 words)

	Magnetic Declination (Site not responding. Last check: 2007-11-04)
		Since magnetic observations are neither uniformly nor densely distributed over the Earth, and since the magnetic field is constantly changing in time, it is not possible to obtain up-to-date values of declination directly from a database of past observations.
		Since magnetic field models such as the IGRF are approximations to observed data, a value of declination computed using the model is likely to differ somewhat from the "true" value at that location.
		When using magnetic declination values, keep in mind that when you are located west of the 0° line-of-declination, the declination is east, whereby you must subtract the declination value from the calculated azimuth value.
	www.spacecom.com /customer_tools/html/body_mag_dec.htm (845 words)

	magnetic declination (Site not responding. Last check: 2007-11-04)
		In early 1998, the average position of the modeled north magnetic dip pole (according to the IGRF-95 geomagnetic model) is 79.5° N, and 106.3° W, 40 kilometers northwest of Ellef Ringnes Island in the Canadian Arctic.
		Anomalous declination is the difference between the declination caused by the Earth's outer core and the declination at the surface.
		Isogonic or declination charts are plots of equal magnetic declination on a map, yielding its value by visually situating a location, and interpolating between isogonic lines.
	earthsci.org /education/fieldsk/declin.htm (2663 words)

	Magnetic Declination
		Declination is shown on all USGS topo maps, but you need to cautious in using that value.
		The magnetic north pole is constantly moving, as much as several tens of kilometers per year.
		For example, if the declination for your location is 16 degrees east, you simply adjust the north orienting arrow until it is pointing to 16 degrees east on the declination scale.
	members.aol.com /Annapress/Wild8.html (611 words)

	GORP - Magnetic Declination - How to Navigate the Backcountry
		Magnetic declination, also known as variation and deviation, is the difference in degrees between true (polar) north and where the earth's magnetic lines of force are actually focused.
		Your compass's north-seeking arrow pivots within the housing to point at magnetic north, so to account for this deviation between magnetic and true north, you must either add or subtract the difference in degrees between the two norths, unless you happen to be standing on a line of no variation/deviation, called the agonic line.
		If you have westerly declination, you must remove the difference between true and magnetic north by turning the map and compass together to the east (right) exactly the number of degrees of declination shown in the diagram, making sure the compass remains aligned on the true north line of the diagram.
	gorp.away.com /gorp/publishers/menasha/how_surv2.htm (799 words)

	Magnetic Declination
		Magnetic declination is the difference between true north (the axis around which the earth rotates) and magnetic north (the direction the needle of a compass will point)
		Magnetic north is determined by the earth’s magnetic field and is not the same as true (or geographic) north.
		The exact amount that you need to adjust the declination on your compass to reconcile magnetic north to true north is given in the map legend to the left of the map scale.
	geology.isu.edu /geostac/Field_Exercise/topomaps/mag_dec.htm (368 words)

	Magneticosphere - Earth's Magnetic Field
		Earth's magnetic field (and the surface magnetic field) is approximately a magnetic dipole, with one pole near the north pole and the other near the geographic south pole.
		Magnetic declination from true north in 2000.The locations of the magnetic poles are not static but wander as much as 15km every year (Dr. David P. Stern, emeritus Goddard Space Flight Center, NASA).
		Using a magnetic detector (a variant of a compass), scientists have measured the historical direction of the Earth's magnetic field, by studying the layered iron-rich lava rocks.
	www.crystalinks.com /magnetics.html (1497 words)

	compass tutorial (Site not responding. Last check: 2007-11-04)
		The compass needle is magnetic and aligns itself with the earth's magnetic field such that the white end of the needle points toward the north magnetic pole (we'll talk about the difference between the geographic north pole and the magnetic north pole shortly).
		An expedition by the Geological Survey of Canada in 1994 determined that the average position of the north magnetic pole for that year was 78.3anddeg; N, 104.0anddeg; W (near Ellef Ringnes Island in the Canadian Arctic).
		The angle between true north and magnetic north is called the magnetic declination and changes with your location and, at any one location, with time.
	earthsci.org /education/fieldsk/compass/compass.html (1824 words)

	MikeAndrew.com - True & Magnetic North (Site not responding. Last check: 2007-11-04)
		And because Earth's magnetic field is irregular (see map), at any particular location the compass needle may not point directly at the magnetic north pole.
		A declination is either an east declination, which means that magnetic north is to the east (right) of true north from that location, or a west declination, which means that magnetic north is to the west (left) of true north from that location.
		Magnetic north at the location of the map today may not be the same as it was in 1999.
	home.att.net /~mandrew/wilderness/northexplanation.htm (1788 words)

	Earth's Magnetic Field Summary - Earth's Magnetic Field Information
		The remainder is caused by the interaction of the main magnetic field and the solar wind and by electric currents in the ionosphere.
		The degree of the departure was known as magnetic declination.
		He mounted magnetized needles horizontally and vertically, determining that the magnetic force came from the Earth itself, and not electrical influence from the sky.
	www.bookrags.com /sciences/sciencehistory/earths-magnetic-field-wsd.html (982 words)

	unsaved:///newpage2.htm (Site not responding. Last check: 2007-11-04)
		If the site has an east magnetic declination it is subtracted from the true direction and a west declination is added to the true direction.
		In Figure 1 the magnetic declination is 10 degrees to the east.
		In other words, if you were using magnetic north as your frame of reference, the wind would be blowing from a direction 10 degrees west of magnetic north, i.e., 350 degrees magnetic.
	www.nws.noaa.gov /asos/magwind.htm (310 words)

	Magnetic North Pole Remains Elusive, Alaska Science Forum
		Magnetic Observatory, home to a few instruments that are about 1,000 times more sensitive to Earth's magnetic field than a hand-held compass.
		He or she would also need to be dressed in warm but breathable clothing, because the magnetic north pole is as far north as its name suggests, and it is always on the move.
		Magnetic north is hard to pin down, sometimes moving up to 50 miles each day due to the effects of the solar wind, particles from the sun that also produce the aurora.
	www.gi.alaska.edu /ScienceForum/ASF16/1632.html (627 words)

	Magnetic Field - Declination Component for the Epoch 1995.0
		The magnetism of the Earth is referred to as geomagnetism.
		Scientists at the USGS and at other agencies around the world compile data on the magnetic field in five year increments, which is then used to produce a model of the magnetic field called the International Geomagnetic Reference Field (IGRF).
		Declination is an important measurement because the magnetic poles of the Earth do not line up precisely with the rotational axis of the Earth.
	nationalatlas.gov /mld/dmfcntl.html (652 words)

	Setting the magnetic declination (Site not responding. Last check: 2007-11-04)
		As mentioned earlier, the magnetic declination in the map area should be printed on the map (left of the scale at the bottom of a USGS 7.5’ quad).
		If you are using a Brunton compass, you set the magnetic declination by turning the declination setting screw on the side of the compass until the reading on the graduated circle in the compass lines up with the index pin at the top of the compass at the proper declination.
		line of zero declination, then the index pin or marker on your compass should be west of the 0° marker on the graduated circle (and vice-versa if you are east of the line of zero declination).
	www.cs.nmsu.edu /~jbj/index_auxil/idaho_virtual_campus/decl_setting.htm (410 words)

	Magnetic Field - Secular Variation of the Declination Component for the Epoch 1995.0
		Magnetism is a force produced between electric currents.
		The Magnetic Field - Secular Variation of the Declination Component for the Epoch 1995.0 map layer shows the annual change in the declination component as isoporic lines (lines of equal annual change in the declination of the Earth's magnetic field), derived from the International Geomagnetic Reference Field (IGRF) for the epoch 1995.0.
		The declination component and the secular variation of the declination component change smoothly over most of the Earth except in a region surrounding each geomagnetic pole.
	www.nationalatlas.gov /mld/dsvcntl.html (686 words)

	All About Maps : Declination & Direction (Site not responding. Last check: 2007-11-04)
		Magnetic North is the direction toward which a compass needle points within the map area.
		The angle between Magnetic North and True North is known as magnetic declination.
		Because the magnetic pole shifts westward with time, the declination needs to be monitored and updated for accurate navigation.
	collections.ic.gc.ca /allaboutmaps/aaMaps_M3_declination_Z.htm (327 words)

	How to Deal With Declination
		Declination varies dramatically all over the planet—as much as 50 degrees just within the United States—and the only way to find the correct declination for a given area is by looking it up.
		Search using "magnetic declination city" where you replace 'city' with the nearest city (or whatever point of reference is most convenient) for the area whose declination you want.
		You'll do the opposite as before: If the declination is west, subtract the declination from magnetic north, and if the declination is east, add the declination to the magnetic north reading.
	www.atlasquest.com /tutorials/compass/declination.html (632 words)

	What is declination?
		The compass actually points in the directions of the horizontal component of the magnetic field where the compass is located, and not to any single point.
		Declination varies from 0 to 30 degrees in most populated regions of the world.
		The actual value of declination and its annual rate of change for your area will usually be shown on your map.
	www.thecompassstore.com /whatisdec.html (472 words)

	Magnetism : The Earth’s magnetic field
		Current scientific theories attribute the earth's magnetism to convection currents that move the liquid metal in the outer core, approximately 3,000 kilometers beneath the Earth’s surface.
		Magnetic North and South are not the same as geographic North and South.
		You can see maps and compute magnetic declination for any location in the world at the Geomagnetism pages of the US National Geophysical Data Center.
	www.seed.slb.com /qa2/FAQView.cfm?ID=532 (337 words)

	Online Hunting Magazine For Nova Scotia Hunters - Magnetic Declination - by Gary Micklethwaite (Site not responding. Last check: 2007-11-04)
		Magnetic North is approximately 150 West of Frobisher Bay and it moves yearly.
		This angle, between Grid and Mag, is known as the Grid Magnetic angle and it is the one we are concerned with when navigating from a map to the ground.
		So if you remember the rules for applying the Magnetic Declination to your compass when you are navigating with a map you cant go wrong.
	www.novascotiahunting.com /huntzine/g0072004.asp (839 words)

	Compass / Clinometer FAQs
		The compass needle and magnet are separated in the Suunto Global Navigator allowing it to be used effectively in all 5 of the earth's zones.
		Magnetic declination is sometimes referred to as the magnetic variation or the magnetic compass correction.
		A magnetic declination of 12 degrees West means that magnetic North lies 12 degrees West of true North.
	www.wide-screen.com /support/FAQsuunto.shtml (702 words)

	Declination from a Map (Site not responding. Last check: 2007-11-04)
		The easiest way to determine the magnetic declination of a given location is to look at a topograpic map of the area.
		The present magnetic declination for this location is 16 degrees west of true north.
		You can also determine local magnetic declination by measuring the bearing between two landmarks (they should be well separated in terms of distance).
	gly.fsu.edu /~kish/field/projects/p4/D1.htm (202 words)

	Magnetic Declination FAQ
		In mid 2002, the average position of the modeled north magnetic dip pole (according to the IGRF-2000 geomagnetic model) is 81.5° N, and 111.4° W, in the Canadian Arctic Ocean.
		MN (Magnetic North) On this version of the Silva 7NL (Polaris), the south-pointing end of the needle is 17 millimeters (0.67") long and the north-pointing end is 16 millimeters (0.63").
		Magnetic observation of solar events is one basis for the formulation of theories of solar processes.
	www.geocities.com /magnetic_declination (5869 words)

	USGS National Geomagnetism Program \| Intro to Geomag
		The magnetic field of the Earth is often times described as being approximately dipolar, with field lines emanating from the south geomagnetic pole and converging at the north geomagnetic pole, as depicted in the figure below.
		The geographic variation of declination is indicative of the field's complexity, with declination contours converging at the geomagnetic poles.
		In fact, magnetic models and charts must be periodically updated to accommodate the continual secular variation of the field.
	geomag.usgs.gov /intro.php (2887 words)

	Solar Pathfinder \| Magnetic Declination
		When printed maps were the only way of getting this information, the declination values were somewhat out of date by the time the maps got to the general public.
		Example: for Linden, TN 37096, the latitude is 35.599784 and the longitude is 87.865582; on May 1, 2003 the magnetic declination is “1° 33' W changing by 0° 6' W/year.” It is written in degrees (°) and minutes (').
		For your purposes, round the number of minutes up or down (60 minutes = 1 degree) and use that number for the magnetic declination (in the example, you could round off the degrees to 2° West of North (negative side of the number line) and rotate the magnetic declination dial clockwise to -2 degrees).
	www.solarpathfinder.com /magnetic.html (747 words)

Try your search on: Qwika (all wikis)