Join Date: Feb 2010
Location: Narragansett Bay
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Re: Magnetic interference from mast affecting AP?
I would be surprised if your mast itself is made of any sort of ferrous iron. If aluminum, that would not interfere with the compass. Of course, any stainless steel bits might.
Generally, magnetic interference would cause the AP compass to be wrong, but typically consistently wrong and not necessarily cause a constant turn. Nevertheless, APs don't always work on magnetics alone and there could be other interference. Indeed, there could be another problem altogether.
Would it be too difficult to lift the mast off the deck and test it again? Unfortunately, electronics going screwy over the winter is SOP. Sometimes it's just corroded connections that get worse as metal contracts in the colder temps.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.