Wet gear and condensation
What *actually* worked was the following. At the dock we put a small West Marine UFO looking “dryer” under the v-berth (in the storage area) with the cord poking out a vent hole, plus an electric blanket under the mattress but over the hypervent. At anchor, we use a piece of flexible hose stuck into the vent hole to warm underneath the vberth and we turn on a fan at night which is at the foot of the vberth to keep our breath from making the area damp. There are other things that we could do, but they involve more effort or more amps – and hey, we’re headed SOUTH.