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I always worried about this and talk about over concerned I put the Ritchie HD-75 on the boat and checked it to the GPS readings from the furuno and then went and put an electronic Richie flux gate compass (they dont make it anymore )on this boat and the magnetic says its only off by 1 degree.And wow will anything metal that can be magnitized on or near the dash throw the compass way off.Even screws used to hold something on.Always use stainless , brass or aluminum and watch the stainless as some will magnitize below 8-18 grade
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