David Barrie, a Fellow of the Royal Institute of Navigation, has sailed all over the world and made many long passages. He is a series consultant for the National Geographic channel series, “Incredible Animal Journeys.” After studying experimental psychology and philosophy at Oxford University, he served in the British Diplomatic Service, then worked in the arts and as a law-reform campaigner. His book Sextant was shortlisted for the Mountbatten Literary Award and won the Royal Institute of Navigation’s Certificate of Achievement. The great-great-nephew of J. M. Barrie, he is married with two daughters. Learn more at davidbarrieauthor.org.