{"product_id":"portneys-ponderables-brain-teasers-for-navigators-9780914025191","title":"Portney's Ponderables: Brain Teasers for Navigators","description":"\"Navigation puzzles, controversies, historical problems, and other ponderables demystified by an expert navigator and writer. Joe Portney is a US Naval Academy graduate and Air Force navigator who has participated in three historic flights over the North Pole. He is a past President of the Institute of Navigation and recipient of the Weems Award for continuing contributions to the art and science of navigation. He has produced a wonderful little book here, chock filled with interesting tidbits, each of which can be read in a few minutes but will stimulate your thought for many days to come. Some are very basic, others more involved, but he provides a clear explanation of each. Some refer to math computations that we might not all be familiar with, but this is not a distraction from the main points being made even in these few cases.\"\u003cbr\u003e","brand":"Starpath Publications","offers":[{"title":"Default Title","offer_id":50330393280786,"sku":"9780914025191","price":9.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0831\/4771\/8930\/files\/img_c733f473-ae88-4c95-8c6c-bb2a5062958c.jpg?v=1727800260","url":"https:\/\/surprise-castle.myshopify.com\/products\/portneys-ponderables-brain-teasers-for-navigators-9780914025191","provider":"Surprise Castle","version":"1.0","type":"link"}