I think it has to do more with battery life as the first release of iOS 9 drained battery faster than prior releases and the GPS is expensive from a power standpoint. I think the non watch devices sacrificed precision time for runtime
Content by Scott Typos by Siri > On Oct 20, 2015, at 12:09 PM, Paul <tic-...@bodosom.net> wrote: > > On Tue, Oct 20, 2015 at 4:02 AM, Brian Garrett <garrettbrian1...@gmail.com> > wrote: >> ... As measured by NTP apps such as Emerald Time and Watchville, > millisecond accuracy comparable to the soon-to-be-released Apple Watch was > now commonplace, with typical offsets of 5 ms or less, rather than the > several seconds of offset typical under the previous release. > > Network connected iOS devices not paired with a watch use (s)ntp at large > intervals rather than the mobile network or GPS. The offsets appear to be > somewhat random -- both positive and negative, large (s) and small (ms). I > assume it's related to the environment and the last time the offset was > corrected. > >> Now, with the latest version, iOS 9, the Apple Watch level accuracy > previously available to iPhone users has gone away. Once again, your > iPhone will be as much as several seconds slow as measured by NTP, unless > you force an update to the phone’s clock by opening a GPS app. > > I checked on an iPad (but presumably that shouldn't matter). My current > offset is -1.6 s (fast, and slowly increasing) as measured by Time > independent of GPS which I woke with Observatory which uses both NTP (for > time) and the GPS (for location). Restarting the iPad causes a step. This > compares with +1 to -3 ms on my phone. > > I'll admit the above is slightly speculative because I haven't checked > network traffic yet but I will shortly. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.