Is Deperming and Degaussing the Same Thing?

Deperming is removal of permanent magnetic field of the floating vessel whereas degaussing is removal of induced magnetic field.

What is also known as degaussing?

Degaussing, commonly called erasure, leaves the domains in random patterns with no preference to orientation, thereby rendering previous data unrecoverable. There are some domains whose magnetic alignment is not randomized after degaussing.

What is Deperming of a ship?

Deperming is a procedure for erasing the permanent magnetism from ships and submarines to camouflage them against magnetic detection vessels and enemy marine mines.