Ventilation on the Hunter is fair at best, very poor with the main hatch boards in. The forward hatch has a vent position however any windblown rain comes in over the v-berth and forward settee so it works if someone is on board to monitor but not something I would leave open when away. The opening ports are also not a great choice to have/leave open when raining, windblown or not. The protected hatch is over the aft cabin and when in vent mode is protected by the cockpit locker lid it lives under. This was a similar situation on the Island Packet, that was partially solved with a passive vent installed on the forward hatch and leaving the small hatch in the head area in the vent position.

I was thinking of adding a solar vent on the cabin top to vent the boat when it was closed up as well as under way. The problem is choosing a spot. The area port side over the head has a winch and rope clutches, forward of that is a possibility. Same on the starboard side. I also have no idea where the 12v runs are in the overhead, I guess you cuts your hole and takes your chances? As I said, in the past I have added a passive vent to the hatch in the IP and two of our Catalinas, that solved the positioning issue. The round forward hatch on the Hunter really doesn't seem to lend itself to an installation like that. You would have to open the hatch to close the bung on the vent if you needed to.