[Xastir] GNGGA vs GPGGA support

[Tom Russo]

On Sat, Apr 13, 2019 at 03:40:37PM -0500, we recorded a bogon-computron collision of the <kg4wsv at gmail.com> flavor, containing:
> Works on my uBlox CAM-M8. 

Glad to hear it!

> > On Apr 11, 2019, at 2:58 PM, Tom Russo <russo at bogodyn.org> wrote:
> > 
> > GNSS, GLONASS, Beidou, and Gallileo support is no on the main branch of
> > the Xastir repo, no fork needed.  Update your clone, and you should be able
> > to use Xastir with multi-constellation receivers now.  So far it has only been
> > tested with GPS and GNSS receivers, but it should work with all the others.
> > 
> > If you try it and it doesn't work, please open a bug report on GitHub, and
> > we'll run it to ground.
> > 
> > On Wed, Apr 10, 2019 at 10:56:38PM -0600, we recorded a bogon-computron collision of the <russo at bogodyn.org> flavor, containing:
> >> Turns out that the GNGGA/GNRMC vs. GPGGA/GNGGA issue is the reason for
> >> the newly opened issue #53 on github (https://github.com/Xastir/Xastir/issues/53), 
> >> and I believe I have it fixed with pull request #58 (https://github.com/Xastir/Xastir/pull/58)
> >> 
> >> If any users with GLONASS receivers that emit GNGGA/GNRMC sentences (such
> >> as the DRAWS hat for Raspberry Pi) would like to test it out, 
> >> you can get it via:
> >> 
> >>   cd <your clone>
> >>   git checkout master
> >>   git checkout -b tvrusso-feature-supportglonass master
> >>   git pull https://github.com/tvrusso/Xastir.git feature-supportglonass
> >> 
> >> Then rebuild Xastir and try it out.
> >> 
> >> The more folks I can get testing this the better.  I won't merge to master
> >> until I at least confirm that it helps the GN vs. GP thing.  As far as I can
> >> tell so far, I haven't borken it for GP.
> >> 
> >> On Sun, Dec 02, 2018 at 02:52:06PM -0600, we recorded a bogon-computron collision of the <kg4wsv at gmail.com> flavor, containing:
> >>> I just started playing with a u-blox 8 family GPS.  It's capable of
> >>> receiving multiple GNSS simultaneously. At first glance this unit doubles
> >>> the number of available satellites just because it's listening to GLONASS
> >>> and GPS at the same time.
> >>> 
> >>> Of course there's a downside. In APRS-land we're used to dealing with a
> >>> single "talker ID" that indicates we're dealing with GPS (the name of the
> >>> US system) - that's the "GP" in GPGGA and GPRMC. This system uses GN as the
> >>> talker ID when it's listening to multiple systems.  I can configure it to
> >>> use GPS only and get my familiar GPGGA, but I stop listening to a bunch of
> >>> available satellites when I do that.
> >>> 
> >>> Since APRS has limited resolution we (APRS users) wouldn't benefit much
> >>> from increased accuracy, but we would get something from having a much
> >>> larger constellation available.
> >>> 
> >>> Has anyone messed with these multi-GNSS receivers? Are the benefits that
> >>> seem obvious at first glance real?
> >>> 
> >>> Would it be appropriate to think about code changes to Xastir (or other
> >>> clients but i don't use those) to use G[PLABN]GGA or G[PLABN]RMC instead of
> >>> restricting ourselves to GP only? There would be 2 cases here, once for the
> >>> attached GPS interface to determine our position, and the GPGGA APRS packet
> >>> type.  I'm actually considering using GGA and RMC packets to get increased
> >>> resolution on a non-144.39 tracking application.
> >>> 
> >>> Does xastir verify the NMEA checksum from an attached GPS?
> >>> 
> >>> -Jason
> >>> kg4wsv
> >>> _______________________________________________
> >>> Xastir mailing list
> >>> Xastir at lists.xastir.org
> >>> http://xastir.org/mailman/listinfo/xastir
> >> 
> >> -- 
> >> Tom Russo    KM5VY
> >> Tijeras, NM  
> >> 
> >> echo "prpv_a'rfg_cnf_har_cvcr" | sed -e 's/_/ /g' | tr [a-m][n-z] [n-z][a-m]
> > 
> > -- 
> > Tom Russo    KM5VY
> > Tijeras, NM  
> > 
> > echo "prpv_a'rfg_cnf_har_cvcr" | sed -e 's/_/ /g' | tr [a-m][n-z] [n-z][a-m]
> > 

-- 
Tom Russo    KM5VY
Tijeras, NM  

 echo "prpv_a'rfg_cnf_har_cvcr" | sed -e 's/_/ /g' | tr [a-m][n-z] [n-z][a-m]