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Installing Brunton 70P

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I had someone tell me that you should run a bead of silicone around the outside of the compass to prevent water from getting under it. The reason being that it is possible for the water underneath it to freeze, expand and possibly crack the compass.

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As I recall water only expands about 10% in volume when it freezes. If you are putting the compass on polyethylene I'd expect that the deck would flex enough such that compass would not crack if water underneath it froze. A glass boat might be stiffer, but I wouldn't expect this to be a problem.

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