NMEA sentences; other GNSS

Gary E. Miller gem at rellim.com
Fri Jun 14 23:36:18 UTC 2019

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:


> 1. What are the minimum/desireable NMEA sentences for a GPS receiver
> to send gpsd for timeservice?


$GPZDA for the year.
$GPRMC for the date and time.

gpsd when asked, will set u-blox to:


> 2. On the ublox neo-M8T, it supports GNSS:
> Galileo
> BeiDou

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.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at rellim.com  Tel:+1 541 382 8588

	    Veritas liberabit vos. -- Quid est veritas?
    "If you can’t measure it, you can’t improve it." - Lord Kelvin
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 851 bytes
Desc: OpenPGP digital signature
URL: <https://lists.ntpsec.org/pipermail/users/attachments/20190614/f727bc2e/attachment.bin>

More information about the users mailing list