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We call it Mind Candy for Navigators...
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Portney's Ponderables by Joe Portney 157 pages, 50 illustrations, paperback, 4.5" x 7", published by Litton Systems, Inc. (2000) $19.95 ...item# 1853
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— This book is temporarily out of print. If you would like to have your name put on the waiting list please email us — 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. An ideal gift for your favorite navigator... including yourself!
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