RTC - Two-Piece GPS Tracking System by Attenti Group
Car OBD2/GPS HUD Digital ECU Computer Speedometer VLT RTC ECT RPM Gauge | eBay
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Raspberry Pi GPS/RTC Expansion Board – Airspy.US
pwnagotchi on Twitter: "Having troubles soldering RTC, GPS and other sensors to your Pwnagotchi? This shield made by Francesco Pagano got you covered! Connect display, RTC and GPS easily! https://t.co/o4nQPer5RN https://t.co/t7OtDjDhpS" /
Building a GPS based time server | Jacob Deane - geek, photographer, engineer
Calibrating an MCU's RTC Using GPS - Circuit Cellar