As we enter this millennium, it is appropriate that we pause to review some of the famous navigation controversies of this century and others and demystify thes...e events. The navigator's dilemma: Where are we? Where are we going? How do we get there?" Here the reader, as a participant, will recognize the navigator's dilemma in resolving these historic ponderables. Did Columbus find longitude on his voyages to the new world? How could Peary navigate to the North Pole without using his sextant? How close could Byrd attain the Pole? Why did Lindbergh select a single-engine airplane for the first solo flight across the Atlantic? How did the Graf Zepplin beat the great circle route in its circumnavigation of the world? How could the tragic ending of the WWII B-24D Lady Be Good be averted? How high can a mountain be? These and other intriguing ponderables await the reader. Throughout his career, Portney has maintained a passion for historic navigational events and puzzles. Portney's Ponderables is a collection of many of these.Detailed info »« Brief info