Patent ID: 6965505

Claim:
A method for effecting closed loop degaussing of a marine vessel having degaussing coils associated therewith, said method comprising: during non-navigation of said marine vessel: obtaining calibration onboard magnetic field measurements relating to said marine vessel; iteratively, at least twice, applying degaussing current to said degaussing coils until reaching a selected reduction of the off-board magnetic signature relating to said marine vessel; and obtaining current values of said degaussing current which is applied upon said reaching of said selected reduction of the off-board magnetic signature; and during navigation of said marine vessel: obtaining real time onboard magnetic field measurements relating to said marine vessel; determining scale factors, said determining scale factors including fitting said obtained real time onboard magnetic field measurements with respect to said obtained calibration onboard magnetic field measurements; finding products of said determined scale factors and said obtained current values; and applying degaussing current to said degaussing coils in accordance with the summation of said products.