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Note that the Adafruit GPS Hat uses GPIO 4, physical pin 7, so you would need to change the commands given in this document.
Later additions have included remote monitoring of the NTP server performance, and more general monitoring of the Raspberry Pi using the standard SNMP functions, with an additional CPU temperature monitoring add-on. Note that good performance is dependant on the GPS unit having a clear view of the sky, particularly the southern part of the sky if you are in the northern hemisphere.
With older GPS receivers this required an outdoor antenna, but more modern units such as those mentioned here may well work indoors providing that some sky is visible, perhaps on the top floor of the building (as I am).
If you have an "RF-proof" roof (lead-lined, perhaps?!
As an experiment, I purchased one of the low-cost credit-card-size Raspberry Pi computers, and have configured it to run NTP (Network Time Protocol).
The resulting performance is good, but it will depend on both the loading of the link between me and the ISP, and the general load on the ISP's network and the general Internet.Since starting this page there have been two developments which make the process somewhat easier - a program has been developed which allows the use of an unmodified operating system by working in user-mode rather than kernel-mode PPS, and a module is now available which plugs directly onto the 26-pin GPIO header of the Raspberry Pi, so no soldering is involved.My thanks to Folkert van Heusden and Anthony Stirk for these developments.There are some helpful Linux commands scattered throughout this page.These notes are almost as much for my own records for the next time I need to visit this project, but I hope they may be helpful to others.