The steel frame of the DSL120 can create changes in the magnetic field measured by the magnetometer. To reduce this effect we mount the magnetometer in a separate pressure case strapped to the wing of towed sled, and execute a 360-degree spin during ascent or descent through the water column to calculate how the metal in the sled affects the north direction reading of the magnetometer. Image courtesy of UCSB, Univ. S. Carolina, NOAA, WHOI.

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