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I've found that on the smaller compass', many of them are under $100 and it is cheaper and easier to buy a new one as the old one lost it's fluid for a reason. Compasses should be adjusted for deviation for the area you're in otherwise they will be off slightly but have never seen one off more then 10 degrees, you can adjust it yourself with a good handheld compass or gps if you can maintain a steady heading and it's not that difficult to calibrate one yourself. Each boat will deviate a compass slightly just because of the other things installed around it such as electronics or metal items.
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