Can't help you with this despite owning a steel boat. Our auto pilot doesn't use a compass, you dial in the course manually. Maybe you have to go with a more basic system.
Valiente is the other notable steeler here and I'd guess he'd be more up on this kind of thing than I am.
One other thought, do you know of the Metal Boat Society ? I'm not on my main computer so I don't have the link with me but just google it and you'll find them. Someone there is bound to be able to assist.
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Greatness is not where we stand, but in what direction we are moving....we must sail, sometimes with the wind, sometimes against it, but sail we must, and not drift nor lie at anchor.- Oliver Wendell Holmes
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