[LEAPSECS] Dava Sobel article about Charlottesville meeting

Harlan Stenn stenn at ntp.org
Mon Jul 22 20:18:40 EDT 2013

"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.


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