如果你想了解更多，文章里重点提到的 John Huth 写过一本书：《The Lost Art of Finding Our Way》。我还会推荐 David Burch 的《Emergency Navigation》。严格来说它讲的不是传统导航，而是如何在没有仪器的情况下在海上导航（里面顺带提到了几种传统的天文导航方法）
if you are interested in learning more, John Huth (who features prominently in the article) wrote a book: The Lost Art of Finding Our Way. I would also recommend "Emergency Navigation" by David Burch. Not about traditional navigation per se, but rather how to navigate at sea without instruments (which touches on some traditional celestial navigation methods)
在 David Burch 的《Emergency Navigation》（http://www.amazon.com/Emergency-Navigation-Improvised-No-Ins...）一书里，这个方法解释得更清楚。拿一块边长1到2英寸的透明冰洲石晶体，……的方向
In the book 'Emergency Navigation' by David Burch ( http://www.amazon.com/Emergency-Navigation-Improvised-No-Ins... ), the method is explained more clearly. With a clear Iceland spar crystal 1 to 2 inches on a side, the direction of the…
如果你想了解更多，文章里重点提到的 John Huth 写过一本书：《The Lost Art of Finding Our Way》。我还会推荐 David Burch 的《Emergency Navigation》。严格来说它讲的不是传统导航，而是如何在没有仪器的情况下在海上导航（里面顺带提到了几种传统的天文导航方法）
if you are interested in learning more, John Huth (who features prominently in the article) wrote a book: The Lost Art of Finding Our Way. I would also recommend "Emergency Navigation" by David Burch. Not about traditional navigation per se, but rather how to navigate at sea without instruments (which touches on some traditional celestial navigation methods)
在 David Burch 的《Emergency Navigation》（http://www.amazon.com/Emergency-Navigation-Improvised-No-Ins...）一书里，这个方法解释得更清楚。拿一块边长1到2英寸的透明冰洲石晶体，……的方向
In the book 'Emergency Navigation' by David Burch ( http://www.amazon.com/Emergency-Navigation-Improvised-No-Ins... ), the method is explained more clearly. With a clear Iceland spar crystal 1 to 2 inches on a side, the direction of the…