not sure where to make the modifications in the library
I can send the equivalent nema NMEA messages for decoding which is not a problem. What I want to do is send the messages back using two xbee pro's.
Modify the library? What library?
Ok... you know I can answer questions about NeoGPS, not XBee, right?[
NeoGPS does not need to be modified to parse these "corrected" fields in the standard sentences.
it is currently setup to ignore characters before the $
what I want to do is send the NEMA NMEA message ... to the rover for accurate positioning which is then decoded by NEOGPS
NeoGPS is the most reliable library in this respect. It will ignore characters until the $ starts the parsing process.
I'm confused, because there is a way to send correction data to the ublox device for it to use for improving its "navigation solution" (aka fix). That way is by sending RTCM messages from the base to the rover (via XBee) and then from the rover Arduino to the rover GPS.
I do not understand why you are sending an NMEA sentence from the base to the rover, nor how an NMEA sentence could improve the rover's location
The M8N on the rover is sending its info back to the base station
In practice, RTK systems use a single base station receiver and a number of mobile units. The base station re-broadcasts the phase of the carrier that it observes, and the mobile units compare their own phase measurements with the one received from the base station.
Maybe I should post a schematic of the set up in case some else goes this route.