Low power consumption (important when running from alternate power)
* Frees the main system for time-critical tasks
* Sometimes more accurate than other methods

A GPS receiver can shorten its startup time by comparing the current time, according to its RTC, with the time at which it last had a valid signal. If it has been less than a few hours, then the previous ephemeris is still usable.

Some motherboards are made without RTCs. The RTC may be omitted out

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