NTP Pool (was Re: Draft Stratum 1 Microserver HOWTO is up)

[Hal Murray]

cbwierda at gmail.com said:
> BTW, I was getting within 5ms using generic ublox-7 puck (no PPS) on an old
> laptop. USB PPS (GR-601W) was reliably under 1ms. 

uBlox is reasonably good.  I'm seeing 25 ms peak-peak on the serial port.

The MT3339 in the Adafruit GPS HAT is all over the place.  Looks like 400 ms 
peak-peak if I ignore a few outliers.

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