Millisecond accurate Chrony NTP with a USB GPS for $12 USD - Austin's Nerdy Things
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Adafruit Ultimate GPS HAT for Raspberry Pi | Adafruit Learning System
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Adafruit 2324 Ultimate GPS HAT for Raspberry Pi A+, B+ or 2 | Rapid Online
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Adafruit 2324 Ultimate GPS HAT for Raspberry Pi A+, B+ or 2 | Rapid Online
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Hardware supporting PTP/PPS with IEEE1588-2008 on the Compute Module 4 · geerlingguy raspberry-pi-pcie-devices · Discussion #457 · GitHub
GitHub - tiagofreire-pt/rpi_adafruit_stratum1_chrony: A straightforward and optimized approach to achieve a cost-effective Stratum 1 NTP server using a Raspberry Pi 3B+ and an Adafruit GPS HAT MTK3339
Adafruit Ultimate Gps Hat For Raspberry Pi A+ Or B+ Mini Kit : Amazon.co.uk: Computers & Accessories
