It's hard to have a good time on a Mac

Horology is hard. It's even harder on a Mac. Yes, even the $7000 Mac Pro. Resources mentioned and products referenced in this video (some links are affiliate links): - Blog post with all the gory details: https://www.jeffgeerling.com/blog/2025/using-gps-most-accurate-time-possible-on-mac - The USB GPS module I was using: https://amzn.to/4j08we1 - Decent little GPS antenna with U.FL adapter: https://amzn.to/43dxctt - NIST-F4 Clock video: https://www.youtube.com/watch?v=CYpBaUgxGl4 - ChronyControl: https://www.whatroute.net/chronycontrol.html - GPSDConfig: https://www.whatroute.net/gpsdconfig.html - Precision Clock by mitxela: https://www.youtube.com/watch?v=SNqm5T5syTM Support me on Patreon: https://www.patreon.com/geerlingguy Sponsor me on GitHub: https://github.com/sponsors/geerlingguy Merch: https://www.redshirtjeff.com 2nd Channel: https://www.youtube.com/@GeerlingEngineering 3rd Channel: https://www.youtube.com/@Level2Jeff Contents: 00:00 - Horology is hard on a Mac 01:04 - It's easier on a Pi, and better on a Watch 02:07 - GPS works on a Mac 03:44 - It's time to go mobile 04:21 - PyGPSClient and GPSd 08:01 - ChronyControl and time sources 09:20 - Getting time from GPSDConfig 10:47 - We have time (offset) 11:54 - Tracking time 13:27 - What's the point?