<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On May 9, 2016, at 5:59 PM, Eric S. Raymond <<a href="mailto:esr@thyrsus.com" class="">esr@thyrsus.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">Frank Nicholas <<a href="mailto:frank@nicholasfamilycentral.com" class="">frank@nicholasfamilycentral.com</a>>:<br class=""><blockquote type="cite" class="">This is the “/etc/ntp.conf” I used when I ran my NTP server on a Raspberry Pi with the Adafruit breakout board (same as current hat). I list it because of the “fudge” line. This was commonly accepted as the proper fudge settings, especially for time2 - 0.350:<br class=""></blockquote><br class="">How do we know this will be correct for the HAT? Is that fudge really<br class="">associated with the MTK3339 itself, independent of surrounding hardware? <br class=""></div></div></blockquote><div><br class=""></div><div>I think it was more specific to the MTK339, because it was setting time2 (time from start of second to when the sentence came that provided rough/NMEA time). That’s been a long time ago, so I may not remember it so well.</div><div><br class=""></div><div>My references were:</div><div><a href="https://www.eecis.udel.edu/~mills/ntp/html/drivers/driver20.html" class="">https://www.eecis.udel.edu/~mills/ntp/html/drivers/driver20.html</a></div><div><a href="https://www.raspberrypi.org/forums/viewtopic.php?f=41&t=1970&start=80" class="">https://www.raspberrypi.org/forums/viewtopic.php?f=41&t=1970&start=80</a></div><div><br class=""></div><blockquote type="cite" class=""><div class=""><div class=""><blockquote type="cite" class="">server <a href="http://tock.usshc.com" class="">tock.usshc.com</a> iburst<br class="">server <a href="http://clock.isc.org" class="">clock.isc.org</a> iburst<br class="">server <a href="http://tick.apple.com" class="">tick.apple.com</a> iburst<br class=""></blockquote><br class="">What is special about these servers?<br class=""></div></div></blockquote><div><br class=""></div></div>There were reliable, GPS based servers that I trusted, that served from a GPS pool.<br class=""><div class=""><br class=""></div></body></html>