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Re: gpsd g10de777bb vs Jackson Labs Micro JLT
From: |
Gary E. Miller |
Subject: |
Re: gpsd g10de777bb vs Jackson Labs Micro JLT |
Date: |
Tue, 17 Aug 2021 10:58:57 -0700 |
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
---------------------------------------------------------------------------
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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