Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very readable story of one man's struggle against many foes

I'll try not to repeat what others have said, though I will take issue with some comments.I could not put this book down. I understood all of the technical explanations, but I should admit to a practical knowledge of navigation (I know the difference between WGS72 & ED50).It explained one thing I had wanted to know for YEARS. In Joshua Slocum's "sailing alone around the world" (which is essential reading for anyone that liked longitude) Slocum says "I had no need of a chronometer because I find my longitude by the lunar method".After reading longitude I know what the lunar method is.The proof of the pudding is in the eating. After reading this book I HAD to go and see the clocks in person, and so I did (you can see the Cutty Sark there as well).I loved the story of Harrison doggedly doing what he knew was right in the face of so many enemies who were so unscrupulous.Buy it.Steve