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Boston Globe technology reporter Bray provides an overview of the social history of technologies used for cartography, navigation, and determining exact locations, beginning with the ancient navigators who looked to the stars for guidance and progressing through to our modern devices that look upward toward GPS satellites (as well as cellular towers and Wi-Fi signals). Many developments along the way were spurred by the need for military advantage, whether that involved communicating with distant troops, accurately mapping enemy positions, or guiding destructive weaponry precisely to its target. As location technology becomes smaller and cheaper, Bray shifts his focus to the corporate world, in which tech companies vie for more accurate maps, better algorithms, and greater ubiquity on consumers' devices. Modern electronics not only allow consumers to know where they are at all times, he points out, they also open up new possibilities for surveillance and loss of privacy. Bray explores the social implications of these changes in the final chapters. He does an exceptional job of integrating technical details and personal stories and framing chapters around specific problems and solutions. VERDICT A superlative choice for technology buffs who want a historical perspective on location and navigation technologies.—Wade M. Lee, Univ. of Toledo Lib.