Join Date: Feb 2010
Location: Narragansett Bay
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For gray water drainage, I would want the thru-hulls at the waterline or below, but not above. Gross staining down the hull, otherwise.
The bilge is an exception. If exiting the side, it is nice if it will remain above the waterline when heeled in that direction. I would probably install a seacock out of an abundance of caution, but I suspect you will never close it, ever.
Another option to glassing them over may be to replace the hardware and safety wire the seacocks closed.
By speed log, do you mean the paddle wheel speed transducer? On a 43 foot boat, that it going to be very helpful. As stated GPS is only speed over ground. You need speed through the water to help detect sail trim or engine/prop issues.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.