If you guys are interested in navigation, I read quite an interesting book a few years ago that I would highly recommend:
Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time
by Dava Sobel
And if you ever get to London, John Harrison's clocks are in the National Maritime Museum in Greenwich. Amazing machines!
Oops! Edited to say that they're actually in Greenwich Royal Observatory and not in the NMM - but you HAVE to go to both so it doesn't really matter!
