Have you already looked for APRS (Automatic Postion Reporting
System) encoding systems? I found many PIC based on google, and they
already implemented the NMEA-183 parser.

   An example:
       http://www.ringolake.com/pic_proj/gps_trak/freetrak.html

   There, Mike Berg made a great work with a simple circuit and
software using 16F627 to decode NMEA-183 and transform it in AX.25
network packets to be sent.

[]s Rafael.


Chris Loiacono wrote:

as well as having examined the NMEA 0183 spec and all I have to do now
is to
figure out how to extract a five byte string out of a sentence that begins
with 4 unique recognizable ASCII characters and is followed by a number of
commas. At 4800 baud or faster I guess I would have to UART all the data
in,
then parse for my favorite characters, which will fall between say, the 7th
& 8th comma.

Has anyone here done this with a PIC that cares to share the wealth?

Chris

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