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The average user may not notice, but the Global Positioning System (GPS) is more reliable today than it was several years ago. Widely used by the military, first responders, surveyors and even consumers, GPS is a navigation and positioning system consisting of ground-based monitors and a constellation of satellites that rely on atomic clocks. A statistical method, developed by the National Institute of Standards and Technology (NIST) and tested and implemented with the help of several...
- The navel or umbilicus.
- In Greek archaeology: A central boss, as on a shield, a bowl, etc.