I have a passive vent on my forward hatch and a solar vent on the main hatch to keep air moving in the cabin. Place one bucket with colander of Dri-Z-Air in forward cabin and one in aft cabin. Empty fresh water tank and plumbing; make sure the holding tank's empty and the bilge is dry; open lockers; put cushions on their sides; make sure through-hulls are closed except for cockpit drains; and check the boat every week or 2 and before and after storms. Works for me in Vancouver.