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Re: Condensation inside sailboat...
Could be water running down the mast into the bilge, creating enough moisture to make excess condensate. A small bilge pump with small tubing, to "suck up the last bit" might help with that. Also, solar vent fans to circulate air and draw off the moisture before it condenses.
You'll get condensation any time the thermal masses and the moisture levels are right, and all you can do is heat, ventilate, dessicate, or wipe it up. A couple of buckets of "dry rid" or something similar might do the trick for you. That doesn't need power or moving parts, just replacing every once in a while.