Magnetic degaussing system in navy

Purpose — reduce a ship’s magnetic signature.
Degaussing neutralizes or offsets a vessel’s hull magnetism so it doesn’t trigger magnetic mines or stand out to magnetic-anomaly detectors.

How it works — installed coil systems and controlled currents.
Permanent coils (installed around the hull) are energized with DC/controlled currents to create a compensating field that cancels the ship’s stray magnetism

Types of magnetic treatment — coiling, deperming (wiping) and periodic re-tuning.
“Coiling” provides continuous biasing; “deperming” (drive-in or wrap) is a high-current treatment that resets the ship’s remanent signature; both are used together to maintain low signatures.

Modern advances — lighter, more efficient HTS and automated control.
Navies have tested high-temperature superconducting (HTS) degaussing coils and digital control/algorithmic systems that reduce weight, improve efficiency, and allow automated signature management.

Infrastructure & testing — degaussing ranges/stations and signature measurement.
Ships are measured and tuned at shore degaussing ranges or with onboard sensors to verify the magnetic signature and adjust coil settings for local geomagnetic conditions.

Operational benefits — survivability and stealth across missions.
Effective degaussing lowers the risk from magnetic mines, reduces detection by MAD and some signatures used by ASW platforms, and supports safe operation in contested littoral areas