RPI + Adafruit GPS sanity check

[Hal Murray]

201905-ntpsec at jslf.app said:
> This is because although the GPS chip knows where and when it is, there is
> much jitter in conveying that time info to any userland process -- i.e.
> encoding into NMEA + transmission over 9600 baud serial line + kernel to user
> land + decoding.

> The instability in the offset is due to what? It's not the online-average of
> the lag since NTP started. 

The basic problem is that the people who wrote the software weren't interested 
in time, probably because it wasn't in the specs.


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