Richard Laager rlaager at
Sat Nov 23 05:09:17 UTC 2019

The NTPviz output says, "TDOP is a dimensionless error factor. TDOP
ranges from 1 to greater than 20. 1 denotes the highest possible
confidence level. 2 to 5 is good."

I routinely have TDOP values below 1, which this text implies is impossible:

What is wrong here, gpsd or ntpviz?


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