15th Edition Hardcover Book As paper navigational charts are replaced by vector images on computer screens, magnetic compasses enhanced by digital flux gate technology, and chronometers joined by atomic clocks, the demand has been mounting for an extensive update to...
By Leif K KarlsenMost navigators have heard of Viking sunstones, but few realize they are more than legend. Leif Karlsen has brought them to life. He shows us how they work—now, and a thousand years ago—and what it was that...
