Re: gpsd g10de777bb vs Jackson Labs Micro JLT

[Gary E. Miller]

Yo Greg!

On Tue, 17 Aug 2021 08:04:13 -0400
Greg Troxel <gdt@lexort.com> wrote:

> "Daniel O'Connor" <darius@dons.net.au> writes:
> 
> > I don't have the spec either but FWIW the ublox docs talk about such
> > numbers if it's in a particular mode.  
> 
> Two comments on NMEA specs:
> 
>   They are not secret, merely copyrighted, so they are available in
> the open standards sense, just not in practice accesible to people
> without a lot of spare money.   It would be useful if someone on the
> list has access to it perhaps via a university or corporate library
> who could comment on what it says.

Been on the gpsd wishlist for over 10 years.

>   I find that the u-blox F9P spec gives information on what that
>   receiver outputs, including talking about varying NMEA versions.  So
>   it seems also like an NMEA spec, in a not-100%-reliable sort of way.

Yes, good, but not 100% reliable.

> My impression at the moment is that there are micro versions of NMEA
> slightly different as the world struggles to move from 2
> constellations (GPS/GLONASS + SBAS) to more.   The F9P section on
> this seems very useful.

At least 10.  So to preoperly decode you need to know the NMEA version.
gpsd has to guess the version from the NMEA.

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

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    "If you can't measure it, you can't improve it." - Lord Kelvin

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