Hi, First email to the list here. I've been curious about this for a little while: does the iPhone get sub-second timing info from GPS?
I did an experiment the other day where my friend and my iPhone clocks had a fairly large offset, of perhaps 0.3 seconds. We were away from any windows. We went to a window, and watched as the Google maps location estimate got to its most accurate setting. I assume the estimate accuracy is based on the number of satellites the phone can see. Once we got this lock, the clocks were then synchronized to within a few ms of each other. I estimate 8 ms, but our method (listening to ticks from a homemade app) was not ultra accurate. This seems to imply that the iPhone does get sub-second timing info from GPS. Can anyone confirm/deny this? On Wed, Apr 1, 2015 at 8:03 AM, Raj <[email protected]> wrote: > Now that you mention it! > > I use the app Emerald Sequoia watch that gives me time from 4 servers but > it does not change the phone time. > Seconds to one decimal place. > > Raj, vu2zap > > At 01/04/2015, you wrote: > >Has anyone else noticed a dramatic improvement in the accuracy of time > >of day on iPhones and iPads since the release of iOS 8.2? The accuracy > >used to be only plus or minus 2 or 3 seconds, now it is about 100 > >times better, usually a few tens of milliseconds. I figure Apple might > >have finally paid some attention to accurate time of day with 8.2, > >possibly because of the Apple Watch. It's a pleasing improvement, I > >hope it's permanent. > > > >-- > >Anthony > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
