Guys, really, really thx on advices, i am probably describing the task incorrectly.
- NMEA - is the protocol for GPS(NMEA 108 to be exact).
- 10HZ is a must, as the more accurate, the better
10HZ NMEA cannot fit into 9600. That's 100% sure ), although calculating required bandwidth of the NMEA0183 is a bit tricky. And some sort of NMEA parser is needed to discard every 5th NMEA sentence.
The application is RC plane OSD and telemetry. It's really weird using 2-3-4 GPS recievers, instead of just one, but with a splitter, that can split the protocol to the required baudrate(requirment of the end device) and the update rate(also a requirment of the end device)