I'm not a clock pro or anything, but it looks like this cites stability numbers around 1e-10 or 1e-11. 5071A says things like 1e-14, but I don't know if it's ap

I'm not a clock pro or anything, but it looks like this cites stability numbers around 1e-10 or 1e-11. 5071A says things like 1e-14, but I don't know if it's apples-to-apples. For "portable" applications, NASA's working on the Deep Space Atomic Clock (DSAC) for easier/better space navigation. DSAC is cited as having 1 microsecond per decade stability, or about 3e-15. While it might be orders of magnitude better than a stabilized quartz oscillator, it looks orders of magnitude away from traditional atomic clocks.