[LEAPSECS] Dava Sobel article about Charlottesville meeting
imp at bsdimp.com
Mon Jul 22 21:11:48 EDT 2013
On Jul 22, 2013, at 6:18 PM, Harlan Stenn wrote:
> "Gerard Ashton" writes:
>> Dava Sobel mention that time displayed on cell phones is consistent.
> That hasn't been my experience.
>> But I just took a course on evaluating emergency exercises where the
>> instructor emphasized the importance of synchronizing watches with the
>> exercise leader, so that records of events by evaluators in different
>> locations can be correlated. The instructor claimed that the times
>> displayed by different cell phones can vary by several minutes.
> That has been my experience.
> I have an NTP app for my iPhone, and so far the most "off" that I've
> seen is 1 minute. But the clock that controls the displayed time is not
> disciplined well at all.
It all has to do with the phone you get... Some do well, others not so well. Where some is only a tiny sliver of the population.
Cellular *NETWORKS* know what time it is down to the microsecond level, but that isn't want's displayed on the phone...
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