How do I verify that DGPS is turned on in a NEMA message?
I believe that the GGA message’s “Position Fix Indicator” is a 2 when DGPS is on. See page 1-2 and 1-3 of [this manual.
Cheers!
gm](http://www.sparkfun.com/datasheets/GPS/NMEA%20Reference%20Manual1.pdf)
Thanks!