Base Station Positioning Error: Single Point Accuracy (Uncalibrated): Horizontal: 1.5 meters (RMS) Vertical: 3.0 meters (RMS) Satellite-Based Differential Accuracy: Convergence Time: 20 minutes Horizontal: 30 centimeters (RMS) Vertical: 40 centimeters (RMS) 00=M Table of Contents Network RTK Calibration*: Horizontal: 1.0 centimeter (RMS) + 1 ppm Vertical: 3.0 centimeters (RMS) + 1 ppm 1 ppm: For every 1 kilometer increase in distance between the aircraft and the base station, the accuracy decreases by 1 millimeter. For example, if the aircraft is 1 kilometer away from the base station, the accuracy is 1.1 centimeters.