Base & Rover – GPS+GLONASS (GG) at one end, GPS-only at the other?
Recent tests conducted by SCCS have proven that using a GPS-only Base (500/900/1200/Viva) and a ‘GG’ Rover in a PDL Base-&-Rover combination act to worsen the estimated position. Because the GLONASS observations are uncorrected (seen at the rover only) they serve to degrade the corrected GPS position. It is advised therefore to turn the GLONASS option off on the rover, and work with GPS only.