Consider some (3) bungee's, on the ceiling of the starboard quarter berth (overhead)....tight enough to "wedge" the book into without it escaping, handy, out of the way, and no woodworking necessary except the 6 screws on the ends....or replace the book with a laptop and Maptech charts connected to a GPS...that works OK too!
John Taylor
Wined-Up Toy (417)
Houston