A GPS connected via a serial port may be used as a reference clock for NTP. If the GPS also supports PPS and is properly configured, and connected, that GPS may also be used as a Pulse Per Second clock reference. NOTE: a USB GPS may work, but is not recommended due to USB bus timing issues.

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Serial port  

 

NMEA sentences
Fudge time 1 ()
(: 0.0).
Fudge time 2 ()
(: 0.0).
Stratum
(: 0).
Flags

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Clock ID
(: GPS).
GPS Initialization
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