Unconditioned GPS signals will give 1 millisecond accuracy, any time of the
day. One microsecond accuracy can easily achieved, after a bit of
calculations; again any time of the day. The regular update that was mentioned
before applies to the correction equation parameters, not to the clocks. The
correction information is used when sub-micro second accuracy is needed.
You can trust your GPS timing to take sightings with your sextant....
One thing to have in mind, the GPS signal is weak and can be jammed easily,
over quite a large area. Or the military can apply SA again if tactically
advantageous. As any electronic navigation aid, it has immense benefits and
quite a few points of potential failure.
Leslie.
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