Instrument for detecting variations in the Earth's magnetic field
MAD rear boom on P-3CThe SH-60B Seahawk helicopter carries a yellow and red towed MAD array known as a "MAD bird", seen on the aft fuselage
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.
^Wragg, David W. (1973). A Dictionary of Aviation (first ed.). Osprey. p. 183. ISBN 9780850451634.
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