- DS3232 as RTC (disciplined by GPS) max. 80s/year (2.5ppm) uncalibrated accuracy (means max. 216ms/day). Should be able to calibrate it to 0.1ppm (8.64ms/day).
- Fibocom GTS-4E-60
- PPS Input to the Pi from the GPS Module
- 16x2LCD or OLED to display date + time and statistics
- DCF77 Receiver (DCF1 from pollin.de)