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Radio clock
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===Astronomy timekeeping=== Although any [[satellite navigation]] receiver that is performing its primary navigational function must have an internal time reference accurate to a small fraction of a second, the displayed time is often not as precise as the internal clock. Most inexpensive navigation receivers have one [[CPU]] that is multitasking. The highest-priority task for the CPU is maintaining satellite lock—not updating the display. Multicore CPUs for navigation systems can only be found on high end products. For serious precision timekeeping, a more specialized GPS device is needed. Some amateur astronomers, most notably those who time [[grazing lunar occultation]] events when the moon blocks the light from stars and planets, require the highest precision available for persons working outside large research institutions. The Web site of the International Occultation Timing Association<ref>{{Cite web |url=http://www.lunar-occultations.com/iota/ |title=International Occultation Timing Association |access-date=2006-07-19 |archive-date=2006-07-20 |archive-url=https://web.archive.org/web/20060720062504/http://www.lunar-occultations.com/iota/ |url-status=live }}</ref> has detailed technical information about precision timekeeping for the amateur astronomer.
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