Hi the rtfm is confusing on the subject of NMEA and PPS. I have an external RS-232 GPS rx with NMEA output feeding /dev/gps0 and 127.127.20.0 in ntp.conf (on intel/linux platform). With the correct use of fudge time1 I can get my ntpd to act as a stratum 0 server and will track pool ntp servers to within 100ms drift . I wish to improve the precision/accuracy and would like to use the PPS kernel/drivers. Is this possible with a simple NMEA device i.e. does the PPS kernel patch give a better stability or do I need a PPS gps clock ?
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