A Magnetic Anomaly Detector (MAD) is a device used to detect variations in the Earth's magnetic field caused by the presence of ferromagnetic materials, such as submarines, shipwrecks, or other metallic objects. This technology is commonly employed in naval operations, particularly for anti-submarine warfare, as well as in geological surveys and archaeological investigations. ### Key Features of Magnetic Anomaly Detectors: 1. **Detection Principle**: MAD instruments measure minute changes in the Earth's magnetic field.
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