Is anyone familar with a "water ballast". My understand is that these boats are good in shallow waters because the have small drafts. Once you get the boat launched from its trailer, then you somehow fill the ballast with water. I''m a novice, sailing a sunfish, but now am looking for a larger boat (19-22 ft) so I don''t have to leave my friends and family ashore. I will be sailing in a fairly shallow sound ( lots of shoals and sand bars). So draft is a big concern for me.