Here are the results of a short test of the satellite tracking by the Trimble R6 rover with GLONASS under forest canopy in Laos. At the time, we were tracking about 4-5 of the GPS satellites exmitting L2C signals, which better tracking performance than regular L2 under adverse conditions.
Forest Site with Undergrowth Cleared
Site 1 - Relatively Open - PDOP 1.6
Site 2 - Open Canopy - PDOP 1.6
Site 3 - Closed Canopy - PDOP 3.4 - Not bad !
Skyplot from Trimble Planning Utility for same time.
