The warship without degaussing coils was demagnetized by applying Flash-D to prevent damage from magnetic mines installed on the sea. Since the degaussing equipment is not installed, the induced magnetization (IM) by the earth's magnetic field can't be removed, so the Flash-D protocol removes the PLM (Permanent Longitudinal Magnetization) and intentionally magnetizes PVM (Permanent Vertical Magnetization) to compensate IVM (Induced Vertical Magnetization) at the same time. However, researches on determining the magnetic field to magnetize the target PVM is insufficient, and it takes a lot of time because small magnetic fields are continuously applied in addition to the Flash-D protocol until the target PVM is magnetized. Therefore, in this paper, the method for determining the vertical magnetic field was analyzed and verified by experiments.
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