[time-nuts] Msg to N.Z. time nuts

[Hal Murray]

> I am assuming my GPS clocks I have are correct (too early here to get
> WWVH reception).

> Hoping the one second delta is not me! 


I have seen consumer grade GPS receivers be off by a second while claiming to 
be OK.

One case was a gross software bug.  I think it was triggered by a pending 
leap second.
  http://www.megapathdsl.net/~hmurray/ntp/leap-gps.gif

One was off by a second for 13 seconds just before the leap second kicked in. 
 I assume they inserted it on GPS midnight rather than UTC midnight.

The interesting cases are just off-by-a-second quirks.  I think they happen 
when the receiver is recovering from a too-weak signal.
  http://www.megapathdsl.net/~hmurray/ntp/GPS18LVC-glitch1-off.gif
  http://www.megapathdsl.net/~hmurray/ntp/GPS18LVC-glitch2-off.gif


-- 
These are my opinions, not necessarily my employer's.  I hate spam.