Review on 🌐 Enhanced GPS HAT for Raspberry Pi A+ or B+ - Mini Kit by Adafruit by Dawn Adams

This board was easy to solder to the connector and install on the Pi. When setting up a Layer 1 NTP server, there are various software setup guides. Try to find one for the OS distribution you like and play around with it. The tricky part is the software configuration, not the hardware, although you can check how the hardware is set up to deliver the PPS signal. With shared memory mode, I get offsets of less than 10 microseconds (not milliseconds) and jitter typically less than 1 microsecond. Given that home NTP clients typically average within a millisecond, this is good enough for me, and I see no need to pursue higher accuracy in kernel-mode drivers.