Magnetic anomaly detector
Instrument for detecting variations in the Earth's magnetic field / From Wikipedia, the free encyclopedia
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A magnetic anomaly detector (MAD) is an instrument used to detect minute variations in the Earth's magnetic field.[1] The term refers specifically to magnetometers used by military forces to detect submarines (a mass of ferromagnetic material creates a detectable disturbance in the magnetic field); military MAD equipment is a descendant of geomagnetic survey or aeromagnetic survey instruments used to search for minerals by detecting their disturbance of the normal earth-field.