We'll briefly discuss traditional celestial navigation, and then discuss the calculations used in your GPS receiver to determine where you are, and relate these to familiar ASA and SSS triangle congruence theorems. In the process we'll learn why your GPS receiver is probably the most accurate clock you'll ever own!
David Hathaway is a retired IBM design automation engineer, a volunteer trip leader and map and compass instructor with the Green Mountain Club, and the executive director of the Vermont State Mathematics Coalition.
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