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You can forget the bubble when you use the Leica GS18 T. It is the original truly tilt compensating GNSS solution that is immune to magnetic disturbances and is calibration-free. The sensor fusion of GNSS and Inertial Measurement Unit (IMU) creates the original true tilt compensating GNSS smart antenna. For GS18, T means tilt.
As you no longer need to watch and level the bubble, you can focus on your task at hand and save time. The GS18 T works directly out of the box without any calibration procedure and like most of the Leica Geosystems GNSS Smart Antennas, you can use it as a rover and a base.