Asking for an L1L2Range message requires also asking for BestUTM and PsrPos.
Getting an RTK and/or PSR solution should be very clear and straightforward. This next push to master will fix the problem of just getting a NavSatFix message for PSRPOS, but we need to clean the whole thing up.
The simple NavSatFix "/gps_fix" topic doesn't output anything right now. It should be derived from BestPos.