Ive had my O'day 20 for about 4 years. It is a 1978 vintage. Forgive my ignorance but I don't have a clue as to the actual purpose of what looks like a drain hole in the floor of the cabin. I occasionally see standing water in the hole and most recently I took the shrink wrap off to take it out of winter storage. It was stored outside and I had a bad tilt on the boat and it had standing water inside. I lifted the nose of the boat to run the water to the back of the boat and most of the water went into this hole, but I did not notice anywhere for that water to drain out. Is this something I should pump out with a bilge pump?