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post #5 of Old 05-20-2019
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Re: Magnetic interference from mast affecting AP?

Most of the steel on your mast is likely to be some type of austinitic stainless. Austinitc stainless steel is generally not magnetic and unlikely to cause this problem.
Many auto pilots do a find zero motion when you start them up. It sounds like the auto pilot is not sensing the zero point so it keeps turning. My guess is a mechanical problem with how the unit senses position inside the drive unit and not a compass problem at all.
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