10 ms is the difference between your GPS getting you to your driveway or just somewhere within a couple of thousand miles.
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I am an amateur radio operator, so I can receive the WWV signal using my shortwave receiver. I will check it occasionally to insure the frequency of my receiver has not drifted. The frequency I check is 10.000.00 MHz. The WWV broadcast in UTC (Coordinated Universal Time). which is equivalent to what was known as GMT (Greenwich Mean Time).
I sometimes operate a digital communication mode that is time critical. On the Windows computer I use in my radio shack, I have a program called NetTime that synchronizes my computer clock using the Simple Network Time Protocol. It insures that my clock is always accurate within a small fraction of a second. I can set the update frequency to any interval I wish. Microsoft Windows has a built-in time synchronization routine, but it is not as flexible as NetTime.
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