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" ... The GPS system in use today uses many of the same principles. By measuring the location of three GPS satellites in geostationary orbit, a given item can be measured to within roughly a meter. Commercial gps feeds generally establish a network of cellular transceivers that actually do the triangulation, then calculates the position of the GPS device. from the transceivers. It should be noted that most commercial GPS systems have a nominal tolerance of about 10m (about 30 feet), deliberately introduced originally due to fears that the military had of terrorists being able to use GPS for precision targeting. That has been relaxed somewhat in the last decade. ... "