Catalina 27? Let me do some math here a second. I've got the chart around here some place. Ok, here we go. Place five high quality mooring balls of eighteen inches in diameter, or larger, within the cabin of the boat. Secure all
hatches and flood the bilge of the boat until the deck is submerged no more than one half inch. The birds will still land there but a birdbath is easier to clean than a bird perch. sorry, i couldn't resist either. (g)