Download or read book Secrets of the Viking Navigators: How the Vikings Used Their Amazing Sunstones and Other Techniques to Cross the Open Ocean written by Leif K. Karlsen and published by Starpath Publications. This book was released on 2018-09-13 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most 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 led the Viking navigators to develop this unique tool for finding the direction to the sun, even when the sun is obscured by clouds or fog.