EPOCH 50 GNSS Receiver Spectra Precision® EPOCH® 50 GNSS, Survey Pro, and Survey Office make a complete, integrated system for precision fieldwork including cadastral, control, location, and construction stakeout. Multi-Constellation GNSS Support The Spectra Precision EPOCH 50 GNSS system, with its 220 channels, makes effective use of the GPS L1/L2/L2C/ L5, GLONASS L1/L2 and BeiDou B1/B2 signals for outstanding satellite coverage and precise positioning. The EPOCH 50 GNSS receiver and antenna use proven technologies to provide both an extremely stable phase center and the tracking of the new stronger L2C and L5 signals. The overall combination of these new signals, multi-constellation support, and receiver processing power provides consistent accuracy and confidence in results.