ventilation

["Gary Rust" <abrasivesspokane@eYtD2QjYiDJ7B3gn1hZDL-UJ_DpFm3cPRtFAK2lqrB5bldyi50egAQSOSYAwPIEwkA5nbLF2RVXfScVmHriveOH9tw.yahoo.invalid>]

I just checked on our boat sitting in water for the winter.  This is 
the first year for the boat in freezing weather.  It had quite a bit 
of moisture on the roof over the v-berth and none in the cabin area.  
There was about 1" in the bilge below the v-berth (I had the v-berth 
cover open).  All cushions are removed.  

I had 2 small dehydrators in the cabin area and they had dissolved 
all the crystals.  I moved them to the v-berth area to see if they 
will help.  I have a blue plastic tarp over the cabin and cockpit.

I'm thinking of putting a ventilator on the boat but really don't 
want to mount it on the deck.  Does anyone have an opinion if a 
ventilator could be mounted vertically on the companion door?  That 
would be the quickest and simplist thing I can do because I have 
extra boards for the companion way.