Five notable books on navigators

One title on the Barnes & Noble Review's list of five top books on navigators:
Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time
by Dava Sobel

The stars could tell early mariners how far they were from the equator, but longitude--the key second component to mapping one's position on the globe--remained out of reach for thousands of years. Sailors