Editing Global Positioning System (section)

==== Accuracy ====
GPS time is theoretically accurate to about 14 nanoseconds, due to the [[clock drift]] relative to [[International Atomic Time]] that the atomic clocks in GPS transmitters experience.<ref>{{cite book |author=David W. Allan |author2=Neil Ashby |author3=Clifford C. Hodge |url=https://www.hpmemoryproject.org/an/pdf/an_1289.pdf |title=The Science of Timekeeping |publisher=Hewlett Packard |year=1997 |via=HP Memory Project}}</ref> Most receivers lose some accuracy in their interpretation of the signals and are only accurate to about 100 nanoseconds.<ref>{{cite magazine |author=Peter H. Dana |author2=Bruce M Penrod|url=http://www.pdana.com/PHDWWW_files/gpsrole.pdf |title=The Role of GPS in Precise Time and Frequency Dissemination |magazine=GPS World |date=July–August 1990 |access-date=April 27, 2014|archive-url=https://web.archive.org/web/20121215031941/http://www.pdana.com/PHDWWW_files/gpsrole.pdf |archive-date=December 15, 2012|url-status=live |via=P Dana}}</ref><ref>{{cite web|url=http://www.atomic-clock.galleon.eu.com/support/gps-time-accuracy.html|title=GPS time accurate to 100 nanoseconds|publisher=Galleon|access-date=October 12, 2012|archive-url=https://web.archive.org/web/20120514001920/http://www.atomic-clock.galleon.eu.com/support/gps-time-accuracy.html|archive-date=May 14, 2012|url-status=live}}</ref>