I am the new owner of a 1984 Catalina 25 wing keel, my first real sailboat. Is it safe to open the head and drain seacocks and leave them open for the duration of a day sail? I was advised that leaving these open longer than necessary could cause water to enter the boat. After sailing season, I plan to use the winter to learn more about the systems on the boat, but for now I'm having too much fun sailing her on Lake St Clair. Thanks for all replies.