If you have a good GPS device that's meant to do time-transfer

I do, and their (I have two, and neither have a display) PPS accuracy is within 20 nanoseconds of UTC (assuming you have accounted for the cable length from the antenna to the device). But the time displayed on a typical handheld consumer GPS for LBS (location based servies) are not "accurate" to that level. (Although some quality handheld GPSs have a PPS (Pulse Per Second) that probably meet the specs you quote.) It is good enough to check against a known source to see if it is outputting UTC or GPS, as per the node I was commenting on.

The time displayed on a handheld GPS is derived from the processing of C/A code and is "old" by the time the display is updated.

But you are correct in that time-transfer is the whole foundation behind GPS, and LBS is only an application of the system.

In reply to Re^6: Converting GPS seconds to readable time&date by n3toy
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.