Model
Trimble r4 RTK GNSS surveying systems
Satellite signals
GPS GLONASS SBAS BeiDou
(RTK)Real Time Kinematics Horizontal
8mm + 1 ppm RMS
(RTK)Real Time Kinematics Vertical
15mm + 1ppm RMS
Data storage
11 MB internal memory
Initialization time
typically <8 seconds
Initialization reliability
typically >99 9%