Every sailor knows that instruments can fail. They get wet, break, fall overboard, etc. Whether you?re safe on your boat or drifting in a life raft, let David Burch show you how to find your way no matter what navigational equipment you have. Learn how to steer by sun, stars, wind, and swells, estimate current and leeway, improvise your own knotmeter or plumb-bob sextant, find the sun in a fogbank, estimate latitude with a plate and a knotted string, and more. . Paperback. 288 pages.