>> The whole point is that ntpd doesn't really know the time.
>> It has a good idea, but the point of using GPS is to get a better answer. 

> How do you find out it's better though?  You have to rely on the fact
> ntpd knows the time to some accuracy to calculate the time1 value for
> the GPS device - so it's a catch-22. 

I screwed up.

The GPS satellites tell you their orbit parameters as well as the time.  So 
if you get a reading from one satellite you can compute where it was when it 
transmitted the time.  If you know where you are located, you can figure out 
the distance and correct for the propagation delays.  That lets you figure 
out the time at your location.


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