Re: [gpsd-users] Ublox EVK-M8T

[Denny Page]

Thanks Eric, I’ll give that a try.

I don’t know about the older chips, but for both the u-blox7 and the u-blox8, 
u-blox specifically recommends that SBAS be disabled for timing applications. 
According to the u-blox documentation, while SBAS improves positional accuracy 
it hurts time pulse accuracy. Presumably for this reason, SBAS is enabled by 
default in the non T units, but disabled in the T units. You can find the SBAS 
recommendation in section 12.2 of the u-blox7 protocol spec, and section 18.2 
of the u-blox8 protocol spec.

Denny


> On Sep 19, 2017, at 14:36, Eric S. Raymond <address@hidden> wrote:
> 
> There are two operatioins here - switch to binary and enable SBAS.
> The next diagnostics steps are:
> 
> 1. Comment out both writes, try running without -b.  Does it achieve sink?
> 
> 2. Comment out one, then the other write.  Which is the bad guy?