https://www.lammertbies.nl/comm/info/GPS-time.html
http://www.laptopgpsworld.com/3235-pc-clock-synchronization-using-gps
http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html
https://frillip.com/raspberry-pi-stratum-1-ntp-server/
https://www.raspberrypi.org/forums/viewtopic.php?t=140585
https://digitalbarbedwire.com/2016/12/26/a-minimal-raspberry-pi-3-gps-time-server/
https://www.rs-online.com/designspark/add-gps-time-and-location-to-a-raspberry-pi-project
https://autonomic.guru/gps-time-on-raspberry-pi/
https://raspberrypi.stackexchange.com/questions/547/how-do-i-attach-a-gps-receiver

https://www.robotshop.com/en/raspberry-pi-gps-module.html?gclid=EAIaIQobChMIq8vF_P6Y2AIVjksNCh06aQvYEAYYAyABEgJSffD_BwE