Magnetic ( compass ) north and geographic ( true ) north are only exactly the same for a small number of places – for example, as of 2000 in the United States only those places on a line running from Wisconsin to the Gulf of Mexico .< ref > But the public may not be as informed, and think there is something mysterious about a compass " changing " across an area as large as the Triangle, which it naturally will.

The Earth's North Magnetic Pole ( currently in the Arctic Ocean, north of Canada ) is physically a south pole, as it attracts the north pole of a compass.

Magnetic north is of interest because it is the direction indicated as north on a properly functioning ( but uncorrected ) magnetic compass.

The Magnetic North Pole wanders, but slowly enough that a simple compass remains useful for navigation.

** The North Magnetic Pole of planet Earth, a point where the north end of a compass points downward

** The South Magnetic Pole of planet Earth, a point where the south end of a compass points upward

Magnetic declination is the angle between magnetic north ( the direction the north end of a compass needle points ) and true north.

Magnetic deviation is the angle from a given magnetic bearing to the related bearing mark of the compass.

Magnetic declination has a very important influence on air navigation, since the most simple aircraft navigation instruments are designed to determine headings by locating magnetic north through the use of a compass or similar magnetic device.

To simplify this task a compass card is added to the RBI to form a " Radio Magnetic Indicator " ( RMI ).

The world's largest compass rose, drawn on the desert floor at Edwards Air Force Base in California, shows the use of degrees measured clockwise from north, North Magnetic Pole | magnetic north in this case.

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.

Magnetic compass adjustment and correction is one of the subjects in the examination curriculum for a shipmaster's certificate of competency.

* MKH – ( Magnetic Key Holder ) used in the description on the type of container used for the cache.

Magnetic resonance imaging ( MRI ), nuclear magnetic resonance imaging ( NMRI ), or magnetic resonance tomography ( MRT ) is a medical imaging technique used in radiology to visualize internal structures of the body in detail.

Magnetic tape was first used to record computer data in 1951 on the Eckert-Mauchly UNIVAC I.

In the 1990s, researchers began to use Electroencephalography ( EEG ), Positron Emission Tomography ( PET ) and more recently functional Magnetic Resonance Imaging ( fMRI ), which is now the most widely used imaging technique to help localize personality traits in the brain.

Magnetic tape data storage is typically used for offline, archival data storage.

Magnetic fields are used for confinement since no solid material could withstand the extremely high temperature of the plasma.

Magnetic susceptibility has been used to distinguish the various garnet species.

Magnetic sails could also be used with beam-powered propulsion by using a high-power particle accelerator to fire a beam of charged particles at the spacecraft.

However, other systems ( such as the Magnetic sails ) could be used for this purpose.

Magnetic bottles can be used to temporarily trap charged particles.

Values used by mobile stations usually need to be converted from Magnetic to True.

* Magnetic Accelerator Cannons, fictional coilguns used by factions of Halo in the Halo video game series

* powerful superconducting electromagnets used in maglev trains, Magnetic Resonance Imaging ( MRI ) and Nuclear magnetic resonance ( NMR ) machines, magnetic confinement fusion reactors ( e. g. tokamaks ), and the beam-steering and focusing magnets used in particle accelerators

Satellite, near-surface and oceanic data from detectors was used to create the World Digital Magnetic Anomaly Map published by the Commission for the Geological Map of the World ( CGMW ) in July 2007.

He was, however, used by Italian authors, starting with the 1959 story Topolino e il ritorno dell ' artiglio magnetico (" Mickey Mouse and the Return of the Magnetic Claw ") by Guido Martina ( plot ) and Giulio Chierchini ( art ).

Magnetic devices had many of the virtues of the discrete and integrated solid-state devices that would replace them, and were extensively used in military applications.

Magnetic Springs earned its name after the discovery of mineral waters used for healing processes.

Magnetic stirrers are often used in chemistry and biology.

Magnetic tweezers can measure femtonewton forces, and additionally they can also be used to apply torsion.

Magnetic IX was used in the more expensive cameras and allowed for a great deal more information exchange.

Following statistical analysis, the results are used to generate a local magnetostratigraphic column that can then be compared against the Global Magnetic Polarity Time Scale.

* Transverse Magnetic modes, a term used in optics and wave theory

Stukeley used some incomplete data about the variation of the North Magnetic Pole ; he extrapolated that it oscillated in a regular pattern.

* Many other forms of spectroscopy also rely upon Fourier Transforms to determine the three-dimensional structure and / or identity of the sample being analyzed, including Infrared and Nuclear Magnetic Resonance spectroscopies.

On January 5, 1841, a British Admiralty team in the Erebus and the Terror, three-masted ships with specially strengthened wooden hulls, was going through the pack ice of the Pacific near Antarctica in an attempt to determine the position of the South Magnetic Pole.

Magnetic sensors were used to determine their position.

In April and May 1994, Larry Newitt, of the Geological Survey of Canada, and Charles Barton, of the Australian Geological Survey Organization, conducted a survey to determine the average position of the North Magnetic Pole at that time.

There she remained for nearly two years, with her crew undertaking sledge journeys to make measurements determine the location of the North Magnetic Pole, and learning from the local Inuit people.

* Magnetic Resonance Imaging-Allows Zak to " look through " a puzzle object to determine an item's function and the way it operates.

* 1821 Edward Sabine, An Account of Experiments to determine the Amount of the Dip of the Magnetic Needle in London, in August 1821 ; with Remarks on the Instruments which are usually employed in such determination.

* Magnetic Resonance Imaging ( MRI ) or Computer Tomography ( CT ) Scan to determine true sparing of quadriceps ;