[Xastir] GPS NMEA sentences decoded by Xastir

[Tom Russo]

On Fri, Jul 21, 2017 at 06:33:38AM +0200, we recorded a bogon-computron collision of the <giuseppe.menga at polito.it> flavor, containing:
> I noted in the file gps.c of the Xastir sources two problems in the decoding 
> of GPS NMEA sentences: only two types of sentences are decoded $GPRMC and 
> $GPGGA, no checksum is tested.
> GPS devices have many different preambles, just in my case $IIRMC and 
> $IIGGA, II stands for integrated instruments, but there are many others that 
> are banned from Xastir.
> Moreover, a control of the checksum is not complicate and it can be added.
> I ask to the developers a comment on this issue, and in the case I can offer 
> a proposal for modification.

If you can code it in yourself, go ahead and make a fork on GitHub, do the 
work on a branch, and issue a pull request.  So long as it doesn't break 
any other use cases, we'll very likely just merge it.

I don't think either Curt or I have GPS units that produce those sentences,
and I don't have time to work on it myself.  I can't speak for Curt, but I
think he's pretty busy these days, too.  If you can't do the coding yourself,
this might take longer than it might seem.

-- 
Tom Russo    KM5VY   SAR502   DM64ux          http://www.swcp.com/~russo/
Tijeras, NM  QRPL#1592 K2#398  SOC#236        http://kevan.org/brain.cgi?DDTNM
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