Magnetic anomaly detector

A Magnetic Anomaly Detector (MAD) is a sensitive instrument used primarily in military and scientific applications to detect subtle changes in Earth's magnetic field caused by large metal objects, like submarines. When a MAD passes over such an object, the magnetic field briefly alters, creating an anomaly that can be detected. This technology allows for covert surveillance beneath the water's surface without physical contact, aiding in submarine detection and research. It relies on the principle that large metal objects influence the natural magnetic field, and sophisticated sensors can pick up and interpret these variations.