Think fast: A GPS satellite transmits a coarse/acquisition (CA) code at 186,000 miles per second (mas o menos), faster than a politician can change principles. Through ranging and triangulation, your GPS receiver will find the runway, or your parole officer can see if you’re drifting off post. The GPS receiver needs at least (_____) satellites to yield a three-dimensional position (latitude, longitude, and altitude). [Choose the best answer to fill in the blank.]
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