[time-nuts] Adafruit Ultimate GPS timing message arrival times

Mark Sims holrum at hotmail.com
Mon Aug 1 12:23:36 EDT 2016

Well,  the whole point of the exercise is to see how well you can do if you DON'T have an internet connection, a 1PPS signal,  or a stratum 1 time server available...  only the humble messages coming from a 10 dollar GPS receiver.  Try getting a net connection in the middle of the Gobi desert (where one user uses Lady Heather's time sync feature to keep their system clocks reasonably accurate).

If you can put the receiver into a binary message mode, you can usually do better than NMEA (but, surprisingly, usually not by much).  And by selecting a receiver that has known good / stable message timing you can do surprisingly well.


> I feel that using the serial NMEA stream would, today, be a last resort, as an Internet sync would be considerably better.  Would you agree with that?

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