The problem with the stock ones is that you have to sit in the bow or the seat right accross from the driver to use them. With cold weather boating no one wants to sit in the bow. I have been thinking on installing a few more heater vents in the back of the boat.
2008 Outback V - Sold but never forgotten.
“Do not wait; the time will never be “just right.” Start where you stand, and work with whatever tools you may have at your command, and better tools will be found as you go along." -Napoleon Hill