NMEA sentences; other GNSS

[Paul Theodoropoulos]

Thanks Gary. I went back and forth on gpsd-users and ntpsec-users, since 
this was specific to time service, I went with the latter - but either 
could have worked I guess!

On 6/14/2019 16:36 PM, Gary E. Miller wrote:
> Yo Paul!
>
> Maybe best asked one gpsd-users at nongnu.org?
>
>
> On Fri, 14 Jun 2019 16:24:49 -0700
> Paul Theodoropoulos <paul at anastrophe.com> wrote:
>
>> Two quickie questions, as I've read an assortment of conflicting
>> things on our old friend the Internet:
> Hehehe.
>
>> 1. What are the minimum/desireable NMEA sentences for a GPS receiver
>> to send gpsd for timeservice?
> Minimum:
>
> $GPZDA for the year.
> $GPRMC for the date and time.
>
> gpsd when asked, will set u-blox to:
>
> $GPGBS
> $GPGGA
> $GPGSA
> $GPGST
> $GPGSV
> $GPRMC
> $GPVTG
> $GPZDA
>
>
>> 2. On the ublox neo-M8T, it supports GNSS:
>>
>> GPS
>> SBAS
>> Galileo
>> BeiDou
>> IMES
>> QZSS
>> GLONASS
> Tests show that just GPS is usually best for the PPS.  YMMV.  Easy to test.
>
>> I know that IMES and QZSS are specific to Japan, so definitely not
>> needed
> IMES is indoor "GPS".  Do not use that!
>
>> Is there any value in having anything other than just GPS enabled,
>> for a stationary timeserver? Does SBAS help at all?
> SBAS corrections help, but raning from SBAS hurts.
>
> RGDS
> GARY
> ---------------------------------------------------------------------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
> 	gem at rellim.com  Tel:+1 541 382 8588
>
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>
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-- 
Paul Theodoropoulos
www.anastrophe.com