The SafePassage Automatic Identification System monitors the real-time data that commercial ships broadcast-including name, position, course and speed-for boats in a 30-mile radius. The system comes loaded with differential GPS, two data receivers, and ports for running information to a laptop or plotter, which will alert you if you're on a collision course. $1,250
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Inside NASA's astronaut bootcamp and the grueling new training regimen for deep space. Plus, ten young geniuses shaking up science today, one writer's quest to analyze every man-made chemical in her body and more.
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