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Pierre, I have a $10 Timex that has perversely proven to be the most
accurate watch I own, typically better than 5 seconds a month. It
embarrasses my old Accutron (once one of the most accurate watches on the
planet) and my more recent brand name quartz watch.

But the GPS, at $100 comparable to many "good" watches, is displying the
time from a dozen or more atomic clocks, which would have cost $3-4 million
EACH for a collective value of 40-50 million dollars worth of time
sources--without counting the costs of putting them in orbit.

Yes, it is perverse to use the GPS as a time source, but having access to a
$50 million dollar time source for less than a hundred bucks, that's
something to seize and not let go of.

   

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