I am thinking about buying a 25 footer on the hudson and sailing her home to champlain, I have never sailed on a river or gone thru the locks,I have sailed champlain for years. So i am just looking for info any good books on the river? how "sailable" is it u north when in narows down? how narrow is it? How tiff is the current? What about good ancorage? Any special tips for ancoring in a river?What have I missed?