As long as the watch time doesn't drift drastically, does it really matter? Set it once from your atomic source and it will be fine for seconds accuracy. It's

As long as the watch time doesn't drift drastically, does it really matter? Set it once from your atomic source and it will be fine for seconds accuracy. It's not like you're going to be doing the timing for the LIGO experiment or similar with this watch. But to directly answer your question, since this board exposes some GPIO and digital buses there's no reason you couldn't built a GPS receiver add on that reads the atomic time from GPS satellite signals and sets the watch time. It would be extra bulk and battery drain of course.