Re: Strange troubles with emulation

[Владимир Калачихин]

30.01.2021 01:36, Gary E. Miller пишет:
> A recevier reporting Dead Reckoning would fail.  If taht case came up,
> that would then need a special case on the special care.  That is how
> driver_nmea0183 became little but special cases.

But why not just ignore bad sentences?



> > > Easier to fix your GGA, set sats used to 4.  One line of sed could
> > > do that.
> >
> > Should it be understood that gpsd ignore checksum?
>
> Nope, you would have to also fix the checksum.  But that is easy.

Heh. The gpsbabel sets count of satellites on GGA sentence to 00 string 
in principle: https://www.gpsbabel.org/htmldoc-development/fmt_nmea.html
I do not know why this is so.

I updated my log player to add a number of satellites to the GGA 
sentence on the fly. With recalculate checksum, of course.
Well, logs, created by gpsbabel, played smoothly.
But I confused:
This https://gpsd.io/NMEA.html#_gga_global_positioning_system_fix_data 
approved that number of satellites are a string of two digits. I write 
one digit by mistake -- and gpsd accept this.

I think this is correct, but perhaps you will think otherwise.