In real life, naval ships run a 1nm degaussing range.
It does several things:
It Demagnetizes as well as it is a timed run at x speed so they can tell how much marine growth will hinder their speed. It also allows the navigator to make adjustments. The run is made both leaving and returning to port.
They also learn how many rpms to make x speed during the run. It greatly assists in Dead Reckoning.
It might do well to mark off 1852m range or multiple thereof and time it as you leave port to get better DR estimate.
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