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Clayton,
The digital compass seems like a great solution and I hope that it works, but if you find that you are constantly frustrated by odd outcomes then it my well be deviation (the compass need not be in contact with the OTA for this to occur, infact the altitude angle may affect your compass readings).
Good Luck,
Greg.
A boat builder that I know tells a wonderful story of swinging a compass (calibrating the compass according to it's surroundings) onboard a large pleasure craft, on returning a second time at the insistance of the owner, who was claiming that the compass was not accurate he decided to spend a day on board to determine the cause of the problem. As the day progressed he noticed a considerable amount of beer being consumed by the guests and came to the conclusion that on the two occassions he had swung the compass the fridge was full of beer in readiness for a day on the water and empty of same on the way back to the harbour creating deviation.
His solution was simply to have the owner half fill the fridge with beer and swing the compass accordingly.
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