Indeed. At my prior company, they use GPS clocks for controlling the signalling on their digital networks, which means they expect the time to be accurate so that they can send 1.5 million bits per second and not have to "slip" any bits, which means they expect accuracy on the order of 1 microsecond (and searches show 0.5..1 microsecond accuracy for GPS-based clocks). But that is more about frequency accuracy than about agreement with UTC.

Some results agree with 10 microsecond accuracy vs UTC. Turning on my GPS (which I hadn't used recently) showed it quite at odds vs my WWV clock. Going to the window so it could sync up with satelites got it to agree with my WWV clock to within a small fraction of a second (just holding them next to each other so I could watch the seconds displayed click along in perfect sync as far as my eyes could tell).

So, yes, GPS units display accurate "human" time (usually in your selected timezone, not just UTC), not something that is 20 seconds "off" nor something only accurate to within several seconds.

- tye        

In reply to Re^6: Converting GPS seconds to readable time&date (agreement) by tye
in thread Converting GPS seconds to readable time&date by flamey

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.