There is a really interesting book about a guy who sailed a Hobie 18 all the way across the Northwest Passage. I think it took him two summers to do it. Lots of ice to contend with, even then. Unfortunately, I can't remember the name of it. Somebody from Canada loaned it to me, and I gave it back. Maybe somebody else will be able to come up with the name. It's a fascinating true-life adventure story.