The debris field is out there from the tsunami that struck Japan in 2011, and here's a report of small (20 foot) boat that came ashore in Crescent City, Ca.

http://www.triplicate.com/News/Break...-in-California

That would be no fun to hit! I've run over large tree branches (20' or so in length), hit large chunks of timber (one left a ding in the hull), and semi-submerged wooden pallets. Adding in the material from Japan should add some spice to the race, eh?

- rob/beetle