For some unmentioned reason Ublox recommends disabling WAAS for precision time applications.  Doesn't make much sense to me....

improved timing accuracy/stability[1].

Hi

That is the standard recommendation from all of the module manufacturers when running in timing (as opposed to survey) mode.
It is based on empirical data that indicates WAAS degrades timing performance once the survey is compete. There are a lot of SBAS
systems out there, so who knows which systems were tested and when they checked them.

Bob

On Sun, Dec 4, 2016 at 9:16 AM, Mark Sims holrum@hotmail.com wrote:

It turns out that your self-survey position is much better then a WAAS
correct position. WAAS is about 1.5 meters I bet a 12 hour self survey is
about 0.5 meters

Are we still talking about NTP?  If so this kind of stuff is lost in the
noise and will never show up on your system clock.

--

Chris Albertson
Redondo Beach, California

Hi

A 12 hour survey done with WAAS turned on is likely to be better than one with WAAS turned off.
How good a 96 hour survey with WAAS on and off is something of a toss up.

Bob