{"product_id":"9780914025191","title":"Portney's Ponderables","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. \u003cp\u003eHe 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.\"\u003c\/p\u003e","brand":"starpath publications","offers":[{"title":"Default Title","offer_id":50008309989616,"sku":"9780914025191","price":9.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0737\/7593\/9824\/files\/9780914025191_p0.jpg?v=1784250410","url":"https:\/\/shop-qa.barnesandnoble.com\/products\/9780914025191","provider":"Barnes \u0026 Noble (DEV)","version":"1.0","type":"link"}