[Xastir] GPS NMEA sentences decoded by Xastir

[Jason KG4WSV]

On Thu, Jul 20, 2017 at 11:33 PM, Menga <giuseppe.menga at polito.it> wrote:
> 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,

Those two sentences are part of the standard, they are provided by
practically all consumer devices, and they are sufficient to provide
xastir with position, course, speed, and other data needed for an APRS
location packet.

> no checksum is tested.

that's maybe a bit sub-optimal, but for most installations of xastir
it would be vanishingly rare for an error detectable by a checksum to
occur.

> 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.

They aren't "banned", they simply are not supported.

What sort of device is providing II sentences and, I assume from your
question, does not provide GP sentences?

Have you experienced errors that would have been detected by checksum
verification?

-Jason
kg4wsv