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Title: Readable, but somewhat off course
Review: Aczel describes the compass as the second most important technological innovation in history, after the wheel. He then proceeds to wander through a series of brief histories without chronological order, giving disproportionate attention to a man who may or may not have lived in Amalfi, Italy. Aczel is at his best in capsule histories of maritime activity, but is frustratingly unsystematic in his chronologies and his descriptions of how the compass is used. He mentions the Global Positioning System, but does not tell us how it works. The figure titled "how the magnetic compass works" is misleading, as it shows the axis of the Earth's magnetic field coinciding with the Earth's axis of rotation. One gets the impression of a hastily written book.
